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JavaScript: Values, Types and Variables
1.
Values, Types, and
Variables Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
2.
Objectives
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
3.
Objectives • Learn about
JavaScript types and comparisons Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
4.
Objectives • Learn about
JavaScript types and comparisons • Understand both implicit and explicit type conversions Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
5.
Objectives • Learn about
JavaScript types and comparisons • Understand both implicit and explicit type conversions • See how to declare and use variables, as well as their scope Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
6.
Introduction to Values,
Types, and Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
7.
Introduction to Values,
Types, and • Handling data is the fundamental task of programming languages Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
8.
Introduction to Values,
Types, and • Handling data is the fundamental task of programming languages Values Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
9.
Introduction to Values,
Types, and • Handling data is the fundamental task of programming languages Values Types Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
10.
Introduction to Values,
Types, and • Handling data is the fundamental task of programming languages Values Types Variables Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
11.
Introduction to Values,
Types, and • Handling data is the fundamental task of programming languages Values Types Variables • JavaScript may seem limited and confining Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
12.
Introduction to Values,
Types, and • Handling data is the fundamental task of programming languages Values Types Variables • JavaScript may seem limited and confining Weakly typed language, so variables are untyped Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
13.
Introduction to Values,
Types, and • Handling data is the fundamental task of programming languages Values Types Variables • JavaScript may seem limited and confining Weakly typed language, so variables are untyped Object-oriented language Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
14.
Introduction to Values,
Types, and • Handling data is the fundamental task of programming languages Values Types Variables • JavaScript may seem limited and confining Weakly typed language, so variables are untyped Object-oriented language • Type system is definitely one of the good parts of the language Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
15.
JavaScript Types
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
16.
JavaScript Types • Defines
types you can use to work with values of different kinds Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
17.
JavaScript Types • Defines
types you can use to work with values of different kinds • Categorizing types Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
18.
JavaScript Types • Defines
types you can use to work with values of different kinds • Categorizing types Primitive and object types Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
19.
JavaScript Types • Defines
types you can use to work with values of different kinds • Categorizing types Primitive and object types With or without methods Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
20.
JavaScript Types • Defines
types you can use to work with values of different kinds • Categorizing types Primitive and object types With or without methods Mutable or immutable Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
21.
Primary Types in
JavaScript Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
22.
Primary Types in
JavaScript Type Category Methods Mutability number Primitive Yes Immutable string Primitive Yes Immutable Boolean Primitive Yes Immutable null Primitive No Immutable undefined Primitive No Immutable object Object Yes Mutable Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
23.
Primary Types in
JavaScript Type Category Methods Mutability number Primitive Yes Immutable string Primitive Yes Immutable Boolean Primitive Yes Immutable null Primitive No Immutable undefined Primitive No Immutable object Object Yes Mutable • Bad part is that it will liberally convert values from one type to another Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
24.
Primary Types in
JavaScript Type Category Methods Mutability number Primitive Yes Immutable string Primitive Yes Immutable Boolean Primitive Yes Immutable null Primitive No Immutable undefined Primitive No Immutable object Object Yes Mutable • Bad part is that it will liberally convert values from one type to another • Special === operator Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
25.
JavaScript Numbers
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
26.
JavaScript Numbers • All
numbers are 64-bit floating-point values Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
27.
JavaScript Numbers • All
numbers are 64-bit floating-point values IEEE 754 standard Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
28.
JavaScript Numbers • All
numbers are 64-bit floating-point values IEEE 754 standard Numbers as large as ±1.7976931348623157x10308 to as small as ±5x10-324 Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
29.
JavaScript Numbers • All
numbers are 64-bit floating-point values IEEE 754 standard Numbers as large as ±1.7976931348623157x10308 to as small as ±5x10-324 Integers between -9,007,199,254,740,992 (-253) and 9,007,199,254,740,992 (253), inclusive Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
30.
JavaScript Numbers • All
numbers are 64-bit floating-point values IEEE 754 standard Numbers as large as ±1.7976931348623157x10308 to as small as ±5x10-324 Integers between -9,007,199,254,740,992 (-253) and 9,007,199,254,740,992 (253), inclusive If you work with numbers outside integer range, you’ll lose precision Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
31.
Integer Literals
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
32.
Integer Literals • Represent
either as base 10 or hexadecimal Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
33.
Integer Literals • Represent
either as base 10 or hexadecimal • All these are valid base 10 values Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
34.
Integer Literals • Represent
either as base 10 or hexadecimal • All these are valid base 10 values 5, 100, 123456789, 0, -100 Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
35.
Integer Literals • Represent
either as base 10 or hexadecimal • All these are valid base 10 values 5, 100, 123456789, 0, -100 • Valid hex values Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
36.
Integer Literals • Represent
either as base 10 or hexadecimal • All these are valid base 10 values 5, 100, 123456789, 0, -100 • Valid hex values 0x1a5f, 0X1A5F, 0x10cd4 Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
37.
Integer Literals • Represent
either as base 10 or hexadecimal • All these are valid base 10 values 5, 100, 123456789, 0, -100 • Valid hex values 0x1a5f, 0X1A5F, 0x10cd4 • ECMAScript doesn’t support octal (base 8) Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
38.
Integer Literals • Represent
either as base 10 or hexadecimal • All these are valid base 10 values 5, 100, 123456789, 0, -100 • Valid hex values 0x1a5f, 0X1A5F, 0x10cd4 • ECMAScript doesn’t support octal (base 8) Some JavaScript implementations support Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
39.
Integer Literals • Represent
either as base 10 or hexadecimal • All these are valid base 10 values 5, 100, 123456789, 0, -100 • Valid hex values 0x1a5f, 0X1A5F, 0x10cd4 • ECMAScript doesn’t support octal (base 8) Some JavaScript implementations support Number starts with a leading zero, followed by digits from 0 to 7 Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
40.
Integer Literals • Represent
either as base 10 or hexadecimal • All these are valid base 10 values 5, 100, 123456789, 0, -100 • Valid hex values 0x1a5f, 0X1A5F, 0x10cd4 • ECMAScript doesn’t support octal (base 8) Some JavaScript implementations support Number starts with a leading zero, followed by digits from 0 to 7 Code won’t be portable Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
41.
Integer Literals • Represent
either as base 10 or hexadecimal • All these are valid base 10 values 5, 100, 123456789, 0, -100 • Valid hex values 0x1a5f, 0X1A5F, 0x10cd4 • ECMAScript doesn’t support octal (base 8) Some JavaScript implementations support Number starts with a leading zero, followed by digits from 0 to 7 Code won’t be portable ECMAScript 5/Strict forbids Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
42.
Real Number Literals
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
43.
Real Number Literals •
Express either as real number or exponential Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
44.
Real Number Literals •
Express either as real number or exponential • Real numbers Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
45.
Real Number Literals •
Express either as real number or exponential • Real numbers 1.0, 1.349201942, .3333333333, 125959403.39201488, 56. Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
46.
Real Number Literals •
Express either as real number or exponential • Real numbers 1.0, 1.349201942, .3333333333, 125959403.39201488, 56. Omit either integral or fractional part Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
47.
Real Number Literals •
Express either as real number or exponential • Real numbers 1.0, 1.349201942, .3333333333, 125959403.39201488, 56. Omit either integral or fractional part • Exponential numbers Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
48.
Real Number Literals •
Express either as real number or exponential • Real numbers 1.0, 1.349201942, .3333333333, 125959403.39201488, 56. Omit either integral or fractional part • Exponential numbers 1.23e12 // 1.23 x 1012 Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
49.
Real Number Literals •
Express either as real number or exponential • Real numbers 1.0, 1.349201942, .3333333333, 125959403.39201488, 56. Omit either integral or fractional part • Exponential numbers 1.23e12 // 1.23 x 1012 1.23e-12 // 1.23 x 10-12 Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
50.
Real Number Literals •
Express either as real number or exponential • Real numbers 1.0, 1.349201942, .3333333333, 125959403.39201488, 56. Omit either integral or fractional part • Exponential numbers 1.23e12 // 1.23 x 1012 1.23e-12 // 1.23 x 10-12 5.90849203e5 // 5.90849203 x 105 Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
51.
Arithmetic in JavaScript
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
52.
Arithmetic in JavaScript •
Expected set of arithmetic operators Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
53.
Arithmetic in JavaScript •
Expected set of arithmetic operators Including + (addition), - (subtraction), * (multiplication), / (division), and % (modulo) Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
54.
Arithmetic in JavaScript •
Expected set of arithmetic operators Including + (addition), - (subtraction), * (multiplication), / (division), and % (modulo) No integral division Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
55.
Arithmetic in JavaScript •
Expected set of arithmetic operators Including + (addition), - (subtraction), * (multiplication), / (division), and % (modulo) No integral division • Math object for other operations Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
56.
JavaScript Strings
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
57.
JavaScript Strings • Ordered,
immutable sequence of 16-bit Unicode characters Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
58.
JavaScript Strings • Ordered,
immutable sequence of 16-bit Unicode characters From zero to as many as will fit in memory Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
59.
JavaScript Strings • Ordered,
immutable sequence of 16-bit Unicode characters From zero to as many as will fit in memory Consist of letters, numbers, punctuation, and spaces Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
60.
JavaScript Strings • Ordered,
immutable sequence of 16-bit Unicode characters From zero to as many as will fit in memory Consist of letters, numbers, punctuation, and spaces Zero-based indexing Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
61.
JavaScript Strings • Ordered,
immutable sequence of 16-bit Unicode characters From zero to as many as will fit in memory Consist of letters, numbers, punctuation, and spaces Zero-based indexing Empty string (“”) has length of zero Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
62.
JavaScript Strings • Ordered,
immutable sequence of 16-bit Unicode characters From zero to as many as will fit in memory Consist of letters, numbers, punctuation, and spaces Zero-based indexing Empty string (“”) has length of zero No special type to represent a single character Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
63.
JavaScript Strings • Ordered,
immutable sequence of 16-bit Unicode characters From zero to as many as will fit in memory Consist of letters, numbers, punctuation, and spaces Zero-based indexing Empty string (“”) has length of zero No special type to represent a single character • Delimit with single ' or double " quotes Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
64.
JavaScript Strings • Ordered,
immutable sequence of 16-bit Unicode characters From zero to as many as will fit in memory Consist of letters, numbers, punctuation, and spaces Zero-based indexing Empty string (“”) has length of zero No special type to represent a single character • Delimit with single ' or double " quotes Can’t mix to delimit string Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
65.
JavaScript Strings • Ordered,
immutable sequence of 16-bit Unicode characters From zero to as many as will fit in memory Consist of letters, numbers, punctuation, and spaces Zero-based indexing Empty string (“”) has length of zero No special type to represent a single character • Delimit with single ' or double " quotes Can’t mix to delimit string Can embed quote not used to delimit string Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
66.
String Delimiters
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
67.
String Delimiters • Either
string is valid Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
68.
String Delimiters • Either
string is valid "'Don't use that food to feed the dog,' she said. 'It's been recalled by the manufacturer.'" Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
69.
String Delimiters • Either
string is valid "'Don't use that food to feed the dog,' she said. 'It's been recalled by the manufacturer.'" '"Don"t use that food to feed the dog," she said. "It"s been recalled by the manufacturer."' Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
70.
String Delimiters • Either
string is valid "'Don't use that food to feed the dog,' she said. 'It's been recalled by the manufacturer.'" '"Don"t use that food to feed the dog," she said. "It"s been recalled by the manufacturer."' • Not valid Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
71.
String Delimiters • Either
string is valid "'Don't use that food to feed the dog,' she said. 'It's been recalled by the manufacturer.'" '"Don"t use that food to feed the dog," she said. "It"s been recalled by the manufacturer."' • Not valid '"Don't use that food to feed the dog," she said. "It has been recalled by the manufacturer."' Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
72.
String Literals
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
73.
String Literals • All
the following are valid string literals Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
74.
String Literals • All
the following are valid string literals "" // an empty string Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
75.
String Literals • All
the following are valid string literals "" // an empty string '' // another empty string Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
76.
String Literals • All
the following are valid string literals "" // an empty string '' // another empty string "Don Kiely" Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
77.
String Literals • All
the following are valid string literals "" // an empty string '' // another empty string "Don Kiely" '1.414' // a number represented as a string Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
78.
String Literals • All
the following are valid string literals "" // an empty string '' // another empty string "Don Kiely" '1.414' // a number represented as a string "My password is 'beetle$%^Bailey392'" Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
79.
Line Breaks in
String Literals Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
80.
Line Breaks in
String Literals • ECMAScript 3 requires string literal on one line Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
81.
Line Breaks in
String Literals • ECMAScript 3 requires string literal on one line ECMAScript 5 allows break with at end of line Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
82.
Line Breaks in
String Literals • ECMAScript 3 requires string literal on one line ECMAScript 5 allows break with at end of line • Problem in ECMAScript 3 but fine in 5: Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
83.
Line Breaks in
String Literals • ECMAScript 3 requires string literal on one line ECMAScript 5 allows break with at end of line • Problem in ECMAScript 3 but fine in 5: "Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal." Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
84.
Line Breaks in
String Literals • ECMAScript 3 requires string literal on one line ECMAScript 5 allows break with at end of line • Problem in ECMAScript 3 but fine in 5: "Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal." • Following is invalid…see the difference? Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
85.
Line Breaks in
String Literals • ECMAScript 3 requires string literal on one line ECMAScript 5 allows break with at end of line • Problem in ECMAScript 3 but fine in 5: "Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal." • Following is invalid…see the difference? "Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal." Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
86.
Escape Sequences in
String Literals Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
87.
Escape Sequences in
String Literals • Include characters that have special meaning by using an escape sequence Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
88.
Escape Sequences in
String Literals • Include characters that have special meaning by using an escape sequence Backslash identifies the special character Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
89.
Escape Sequences in
String Literals • Include characters that have special meaning by using an escape sequence Backslash identifies the special character '"Don't use that food to feed the dog," she said. "It's been recalled by the manufacturer."‘ Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
90.
JavaScript Escape Sequences
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
91.
JavaScript Escape Sequences Escape
Sequence Description ' Single quote or apostrophe " Double quote Backslash 0 Nul character (that’s a backslash-zero) b Backspace f Form feed n Newline r Carriage return t Horizontal tab v Vertical tab xXX The Latin-1 character specified by the two uXXXX hexadecimal digits XX between 00 and ff. For example, The Unicode character specified by the four the copyrightdigits dddd. For example, the π symbol is hexadecimal symbol is xa9. Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
92.
JavaScript Boolean Values
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
93.
JavaScript Boolean Values •
Represents true or false Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
94.
JavaScript Boolean Values •
Represents true or false Usually the result of some logical comparison Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
95.
JavaScript Boolean Values •
Represents true or false Usually the result of some logical comparison • JavaScript can convert any value to a Boolean Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
96.
JavaScript Boolean Values •
Represents true or false Usually the result of some logical comparison • JavaScript can convert any value to a Boolean These are all false Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
97.
JavaScript Boolean Values •
Represents true or false Usually the result of some logical comparison • JavaScript can convert any value to a Boolean These are all false 0 (zero) Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
98.
JavaScript Boolean Values •
Represents true or false Usually the result of some logical comparison • JavaScript can convert any value to a Boolean These are all false 0 (zero) -0 (negative zero) Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
99.
JavaScript Boolean Values •
Represents true or false Usually the result of some logical comparison • JavaScript can convert any value to a Boolean These are all false 0 (zero) -0 (negative zero) "" (empty string) Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
100.
JavaScript Boolean Values •
Represents true or false Usually the result of some logical comparison • JavaScript can convert any value to a Boolean These are all false 0 (zero) -0 (negative zero) "" (empty string) NaN Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
101.
JavaScript Boolean Values •
Represents true or false Usually the result of some logical comparison • JavaScript can convert any value to a Boolean These are all false 0 (zero) -0 (negative zero) "" (empty string) NaN null Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
102.
JavaScript Boolean Values •
Represents true or false Usually the result of some logical comparison • JavaScript can convert any value to a Boolean These are all false 0 (zero) -0 (negative zero) "" (empty string) NaN null undefined Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
103.
JavaScript Boolean Values •
Represents true or false Usually the result of some logical comparison • JavaScript can convert any value to a Boolean These are all false 0 (zero) -0 (negative zero) "" (empty string) NaN null undefined All other values are true Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
104.
Truthy and Falsy
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
105.
Truthy and Falsy •
Any value that converts to true is truthy Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
106.
Truthy and Falsy •
Any value that converts to true is truthy • Any value that converts to false is falsy Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
107.
Truthy and Falsy •
Any value that converts to true is truthy • Any value that converts to false is falsy • When JavaScript expects a Boolean value Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
108.
Truthy and Falsy •
Any value that converts to true is truthy • Any value that converts to false is falsy • When JavaScript expects a Boolean value Truthy value works like true Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
109.
Truthy and Falsy •
Any value that converts to true is truthy • Any value that converts to false is falsy • When JavaScript expects a Boolean value Truthy value works like true Falsy value works like false Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
110.
Truthy and Falsy •
Any value that converts to true is truthy • Any value that converts to false is falsy • When JavaScript expects a Boolean value Truthy value works like true Falsy value works like false • These are generally equivalent Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
111.
Truthy and Falsy •
Any value that converts to true is truthy • Any value that converts to false is falsy • When JavaScript expects a Boolean value Truthy value works like true Falsy value works like false • These are generally equivalent if (result !== 0) Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
112.
Truthy and Falsy •
Any value that converts to true is truthy • Any value that converts to false is falsy • When JavaScript expects a Boolean value Truthy value works like true Falsy value works like false • These are generally equivalent if (result !== 0) if (result) Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
113.
Truthy and Falsy •
Any value that converts to true is truthy • Any value that converts to false is falsy • When JavaScript expects a Boolean value Truthy value works like true Falsy value works like false • These are generally equivalent if (result !== 0) if (result) • But be careful! Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
114.
Truthy and Falsy •
Any value that converts to true is truthy • Any value that converts to false is falsy • When JavaScript expects a Boolean value Truthy value works like true Falsy value works like false • These are generally equivalent if (result !== 0) if (result) • But be careful! The result variable could hold other truthy or falsy values Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
115.
Boolean Methods and
Logical Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
116.
Boolean Methods and
Logical • Boolean values have two methods Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
117.
Boolean Methods and
Logical • Boolean values have two methods toString() returns "true" or "false" Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
118.
Boolean Methods and
Logical • Boolean values have two methods toString() returns "true" or "false" valueOf() returns true of false Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
119.
Boolean Methods and
Logical • Boolean values have two methods toString() returns "true" or "false" valueOf() returns true of false • Logical operators Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
120.
Boolean Methods and
Logical • Boolean values have two methods toString() returns "true" or "false" valueOf() returns true of false • Logical operators && AND Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
121.
Boolean Methods and
Logical • Boolean values have two methods toString() returns "true" or "false" valueOf() returns true of false • Logical operators && AND || OR Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
122.
Boolean Methods and
Logical • Boolean values have two methods toString() returns "true" or "false" valueOf() returns true of false • Logical operators && AND || OR ! NOT Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
123.
Special Values: null
and undefined Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
124.
Special Values: null
and undefined • null Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
125.
Special Values: null
and undefined • null Language keyword Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
126.
Special Values: null
and undefined • null Language keyword An object, but considered a separate type Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
127.
Special Values: null
and undefined • null Language keyword An object, but considered a separate type Absence of a value Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
128.
Special Values: null
and undefined • null Language keyword An object, but considered a separate type Absence of a value • undefined Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
129.
Special Values: null
and undefined • null Language keyword An object, but considered a separate type Absence of a value • undefined Also means absence of value, but in a deeper way Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
130.
Special Values: null
and undefined • null Language keyword An object, but considered a separate type Absence of a value • undefined Also means absence of value, but in a deeper way Predefined global variable Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
131.
Special Values: null
and undefined • null Language keyword An object, but considered a separate type Absence of a value • undefined Also means absence of value, but in a deeper way Predefined global variable Type is undefined (literally, that’s its type) Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
132.
undefined
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
133.
undefined • JavaScript uses
in a few different ways Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
134.
undefined • JavaScript uses
in a few different ways Variable that has been declared but not yet assigned a value Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
135.
undefined • JavaScript uses
in a few different ways Variable that has been declared but not yet assigned a value Function parameter that the calling code doesn’t provide a value for Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
136.
undefined • JavaScript uses
in a few different ways Variable that has been declared but not yet assigned a value Function parameter that the calling code doesn’t provide a value for Property that doesn’t exist on an object Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
137.
undefined • JavaScript uses
in a few different ways Variable that has been declared but not yet assigned a value Function parameter that the calling code doesn’t provide a value for Property that doesn’t exist on an object Array element that doesn’t exist Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
138.
undefined • JavaScript uses
in a few different ways Variable that has been declared but not yet assigned a value Function parameter that the calling code doesn’t provide a value for Property that doesn’t exist on an object Array element that doesn’t exist Function that doesn’t return a value Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
139.
undefined • JavaScript uses
in a few different ways Variable that has been declared but not yet assigned a value Function parameter that the calling code doesn’t provide a value for Property that doesn’t exist on an object Array element that doesn’t exist Function that doesn’t return a value • undefined is read/write in ECMAScript 3, read- only in ECMAScript 5 Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
140.
Use null or
undefined? Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
141.
Use null or
undefined? • Both mean absence of value Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
142.
Use null or
undefined? • Both mean absence of value Can often use interchangeably Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
143.
Use null or
undefined? • Both mean absence of value Can often use interchangeably In fact, null == undefined Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
144.
Use null or
undefined? • Both mean absence of value Can often use interchangeably In fact, null == undefined But null !== undefined Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
145.
Use null or
undefined? • Both mean absence of value Can often use interchangeably In fact, null == undefined But null !== undefined • Best advice Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
146.
Use null or
undefined? • Both mean absence of value Can often use interchangeably In fact, null == undefined But null !== undefined • Best advice Use undefined to represent system-level, unexpected, or erroneous absence of value Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
147.
Use null or
undefined? • Both mean absence of value Can often use interchangeably In fact, null == undefined But null !== undefined • Best advice Use undefined to represent system-level, unexpected, or erroneous absence of value Use null to represent a program-level normal, or expected absence of value Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
148.
Use null or
undefined? • Both mean absence of value Can often use interchangeably In fact, null == undefined But null !== undefined • Best advice Use undefined to represent system-level, unexpected, or erroneous absence of value Use null to represent a program-level normal, or expected absence of value • In other words, use null when you need to express missing value Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
149.
Use null or
undefined? • Both mean absence of value Can often use interchangeably In fact, null == undefined But null !== undefined • Best advice Use undefined to represent system-level, unexpected, or erroneous absence of value Use null to represent a program-level normal, or expected absence of value • In other words, use null when you need to express missing value Let JavaScript manage use of undefined Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
150.
Type Comparisons
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
151.
Type Comparisons • JavaScript
compares primitive values and object values differently Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
152.
Type Comparisons • JavaScript
compares primitive values and object values differently Primitive values by value Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
153.
Type Comparisons • JavaScript
compares primitive values and object values differently Primitive values by value Object values by reference Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
154.
Object Comparisons
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
155.
Object Comparisons • JavaScript
compares objects by reference Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
156.
Object Comparisons • JavaScript
compares objects by reference Equal only if the two variables hold a reference to the same object in memory Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
157.
Object Comparisons • JavaScript
compares objects by reference Equal only if the two variables hold a reference to the same object in memory If hold a reference to two different objects, even if objects are the exact same, they are not equal Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
158.
Type Conversions
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
159.
Type Conversions • Feature
that makes JavaScript easy and hard Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
160.
Type Conversions • Feature
that makes JavaScript easy and hard Does everything it can to implicitly convert values to make useable in a statement Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
161.
Type Conversions • Feature
that makes JavaScript easy and hard Does everything it can to implicitly convert values to make useable in a statement Doesn’t always do what you want Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
162.
Type Conversions • Feature
that makes JavaScript easy and hard Does everything it can to implicitly convert values to make useable in a statement Doesn’t always do what you want • Automatic type conversions Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
163.
Type Conversions • Feature
that makes JavaScript easy and hard Does everything it can to implicitly convert values to make useable in a statement Doesn’t always do what you want • Automatic type conversions Convert to truthy or falsy when expects Boolean Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
164.
Type Conversions • Feature
that makes JavaScript easy and hard Does everything it can to implicitly convert values to make useable in a statement Doesn’t always do what you want • Automatic type conversions Convert to truthy or falsy when expects Boolean Converts anything to a string when expects string Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
165.
Type Conversions • Feature
that makes JavaScript easy and hard Does everything it can to implicitly convert values to make useable in a statement Doesn’t always do what you want • Automatic type conversions Convert to truthy or falsy when expects Boolean Converts anything to a string when expects string Tries to convert to a number when expects number Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
166.
Type Conversions • Feature
that makes JavaScript easy and hard Does everything it can to implicitly convert values to make useable in a statement Doesn’t always do what you want • Automatic type conversions Convert to truthy or falsy when expects Boolean Converts anything to a string when expects string Tries to convert to a number when expects number • Also supports explicit type conversions Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
167.
Explicit Type Conversions
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
168.
Explicit Type Conversions •
You can do it yourself explicitly Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
169.
Explicit Type Conversions •
You can do it yourself explicitly Use when implicit conversions don’t work for you Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
170.
Explicit Type Conversions •
You can do it yourself explicitly Use when implicit conversions don’t work for you Or you want cleaner and clearer code Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
171.
Explicit Type Conversions •
You can do it yourself explicitly Use when implicit conversions don’t work for you Or you want cleaner and clearer code • Various ways Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
172.
Explicit Type Conversions •
You can do it yourself explicitly Use when implicit conversions don’t work for you Or you want cleaner and clearer code • Various ways Wrapper objects Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
173.
Explicit Type Conversions •
You can do it yourself explicitly Use when implicit conversions don’t work for you Or you want cleaner and clearer code • Various ways Wrapper objects Type methods Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
174.
Explicit Type Conversions •
You can do it yourself explicitly Use when implicit conversions don’t work for you Or you want cleaner and clearer code • Various ways Wrapper objects Type methods Global functions Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
175.
Explicit Type Conversions •
You can do it yourself explicitly Use when implicit conversions don’t work for you Or you want cleaner and clearer code • Various ways Wrapper objects Type methods Global functions …among others Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
176.
Formatting Methods and
Parsing Functions Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
177.
Formatting Methods and
Parsing Functions • Don’t have much control with other conversion techniques Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
178.
Formatting Methods and
Parsing Functions • Don’t have much control with other conversion techniques Get a reasonable value in the type you want Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
179.
Formatting Methods and
Parsing Functions • Don’t have much control with other conversion techniques Get a reasonable value in the type you want • JavaScript has specialized methods and functions that give you control Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
180.
Conversions Using Wrapper
Objects Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
181.
Conversions Using Wrapper
Objects • Number, String, Boolean, and Object wrapper objects Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
182.
Conversions Using Wrapper
Objects • Number, String, Boolean, and Object wrapper objects Provide properties and methods for corresponding types Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
183.
Conversions Using Wrapper
Objects • Number, String, Boolean, and Object wrapper objects Provide properties and methods for corresponding types Creates a String object and uses length property Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
184.
Conversions Using Wrapper
Objects • Number, String, Boolean, and Object wrapper objects Provide properties and methods for corresponding types Creates a String object and uses length property o "AppDev".length Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
185.
Conversions Using Wrapper
Objects • Number, String, Boolean, and Object wrapper objects Provide properties and methods for corresponding types Creates a String object and uses length property o "AppDev".length • Can use these functions for explicit conversion Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
186.
Number Formatting Methods
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
187.
Number Formatting Methods •
Give more control than toString() Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
188.
Number Formatting Methods •
Give more control than toString() toFixed() Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
189.
Number Formatting Methods •
Give more control than toString() toFixed() toPrecision() Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
190.
Number Formatting Methods •
Give more control than toString() toFixed() toPrecision() toExponential() Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
191.
Number Formatting Methods •
Give more control than toString() toFixed() toPrecision() toExponential() • All three round number or pad with zeros as necessary Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
192.
Using Variables
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
193.
Using Variables • Way
to temporarily store bits of data Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
194.
Using Variables • Way
to temporarily store bits of data • Necessity in almost every language Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
195.
Using Variables • Way
to temporarily store bits of data • Necessity in almost every language • JavaScript variables are a bit different Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
196.
Variable Declaration
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
197.
Variable Declaration • Not
required, but you should do it Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
198.
Variable Declaration • Not
required, but you should do it • Untyped, so simple: use var with identifier Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
199.
Variable Declaration • Not
required, but you should do it • Untyped, so simple: use var with identifier var count; Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
200.
Variable Declaration • Not
required, but you should do it • Untyped, so simple: use var with identifier var count; var minMsgID; Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
201.
Variable Declaration • Not
required, but you should do it • Untyped, so simple: use var with identifier var count; var minMsgID; var lastName; Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
202.
Variable Declaration • Not
required, but you should do it • Untyped, so simple: use var with identifier var count; var minMsgID; var lastName; • Undefined until initialized Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
203.
Variable Declaration • Not
required, but you should do it • Untyped, so simple: use var with identifier var count; var minMsgID; var lastName; • Undefined until initialized • Can declare and initialize in one statement Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
204.
Variable Declaration • Not
required, but you should do it • Untyped, so simple: use var with identifier var count; var minMsgID; var lastName; • Undefined until initialized • Can declare and initialize in one statement var count = 0; Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
205.
Variable Declaration • Not
required, but you should do it • Untyped, so simple: use var with identifier var count; var minMsgID; var lastName; • Undefined until initialized • Can declare and initialize in one statement var count = 0; var minMsgID = 32629; Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
206.
Variable Declaration • Not
required, but you should do it • Untyped, so simple: use var with identifier var count; var minMsgID; var lastName; • Undefined until initialized • Can declare and initialize in one statement var count = 0; var minMsgID = 32629; var lastName = "Kiely"; Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
207.
Variable Declaration
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
208.
Variable Declaration • Multiple
variables in single var statement Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
209.
Variable Declaration • Multiple
variables in single var statement var count = 0, minMsgID = 32629, lastName = "Kiely"; Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
210.
Variable Declaration • Multiple
variables in single var statement var count = 0, minMsgID = 32629, lastName = "Kiely"; • Break onto multiple lines Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
211.
Variable Declaration • Multiple
variables in single var statement var count = 0, minMsgID = 32629, lastName = "Kiely"; • Break onto multiple lines var count = 0, minMsgID = 32629, lastName = "Kiely"; Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
212.
Variable Declaration • Multiple
variables in single var statement var count = 0, minMsgID = 32629, lastName = "Kiely"; • Break onto multiple lines var count = 0, minMsgID = 32629, lastName = "Kiely"; • Declare and initialize within loops Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
213.
Variable Declaration • Multiple
variables in single var statement var count = 0, minMsgID = 32629, lastName = "Kiely"; • Break onto multiple lines var count = 0, minMsgID = 32629, lastName = "Kiely"; • Declare and initialize within loops for (var i = 2; i <= 36; i++) console.log("Base " + i + ": " + num.toString(i)); Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
214.
Variable Cautions and
Gotchas Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
215.
Variable Cautions and
Gotchas • Variable can hold any type during execution Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
216.
Variable Cautions and
Gotchas • Variable can hold any type during execution var count = 0; <program code> count = "Don"; <more program code> count = false <yet more code> count = "The Duke of Windsor"; Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
217.
Variable Cautions and
Gotchas • Variable can hold any type during execution var count = 0; <program code> count = "Don"; <more program code> count = false <yet more code> count = "The Duke of Windsor"; • Be careful splitting across multiple lines! Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
218.
Variable Cautions and
Gotchas • Variable can hold any type during execution var count = 0; <program code> count = "Don"; <more program code> count = false <yet more code> count = "The Duke of Windsor"; • Be careful splitting across multiple lines! var count = 0 minMsgID = 32629, lastName = "Kiely"; Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
219.
Variable Scope
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
220.
Variable Scope • Scope
is section of code where variable is defined and accessible Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
221.
Variable Scope • Scope
is section of code where variable is defined and accessible • Two scopes in JavaScript Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
222.
Variable Scope • Scope
is section of code where variable is defined and accessible • Two scopes in JavaScript Global Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
223.
Variable Scope • Scope
is section of code where variable is defined and accessible • Two scopes in JavaScript Global Local Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
224.
Variable Scope • Scope
is section of code where variable is defined and accessible • Two scopes in JavaScript Global Local • Local variable has function scope in JavaScript Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
225.
Variable Hoisting
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
226.
Variable Hoisting • Function
scope has an important implication Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
227.
Variable Hoisting • Function
scope has an important implication • All local variables declared within a function Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
228.
Variable Hoisting • Function
scope has an important implication • All local variables declared within a function Visible throughout the body of the function Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
229.
Variable Hoisting • Function
scope has an important implication • All local variables declared within a function Visible throughout the body of the function • Side effect: all local variables are visible even before they are declared Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
230.
Learn More!
Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
231.
Learn More! • This
is an excerpt from a larger course. Visit www.learnnowonline.com for the full details! Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
232.
Learn More! • This
is an excerpt from a larger course. Visit www.learnnowonline.com for the full details! Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
233.
Learn More! • This
is an excerpt from a larger course. Visit www.learnnowonline.com for the full details! • Learn more about JavaScript on SlideShare! Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
234.
Learn More! • This
is an excerpt from a larger course. Visit www.learnnowonline.com for the full details! • Learn more about JavaScript on SlideShare! • Introduction to JavaScript Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
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