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The JavaScript Programming Language Douglas Crockford
Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The World's Most Misunderstood Programming Language
Sources of Misunderstanding ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
History ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Not a Web Toy ,[object Object],[object Object],[object Object]
Key Ideas ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Values ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Numbers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
NaN ,[object Object],[object Object],[object Object],[object Object]
Number function ,[object Object],[object Object],[object Object],[object Object]
parseInt function ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Math ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Strings ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
String  length ,[object Object],[object Object]
String function ,[object Object],[object Object]
String Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Booleans ,[object Object],[object Object]
Boolean function ,[object Object],[object Object],[object Object],[object Object]
null ,[object Object]
undefined ,[object Object],[object Object],[object Object]
Falsy values ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Everything Else Is Objects
Dynamic Objects ,[object Object],[object Object],[object Object],[object Object],[object Object]
Loosely Typed ,[object Object],[object Object]
C ,[object Object],[object Object]
Identifiers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Reserved Words ,[object Object]
Comments ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Operators ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
+ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
+ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
/ ,[object Object],[object Object]
==  != ,[object Object],[object Object],[object Object]
&& ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
|| ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
! ,[object Object],[object Object],[object Object]
Bitwise ,[object Object],[object Object]
Statements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Break statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
For statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
For statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Switch statement ,[object Object],[object Object],[object Object]
Switch statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Throw statement ,[object Object],[object Object],[object Object],[object Object],[object Object]
Try statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Try Statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
With statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Function statement ,[object Object],[object Object],[object Object]
Var statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Scope ,[object Object],[object Object],[object Object]
Return statement ,[object Object],[object Object],[object Object],[object Object],[object Object]
Objects ,[object Object],[object Object],[object Object]
Collections ,[object Object],[object Object],[object Object],[object Object],[object Object]
Object Literals ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Object Literals var myObject = {name: "Jack B. Nimble", 'goto': 'Jail', grade: 'A', level: 3};  var theName = myObject.name; var destination = myObject['goto']; 3 "level" "A" "grade" "Jail" "goto" "Jack B. Nimble" "name"
Maker Function ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Object Literals var myObject = {name: "Jack B. Nimble", 'goto': 'Jail', grade: 'A',  format: {type: 'rect', width: 1920, height: 1080, interlace: false, framerate: 24} };
Object Literals var myObject = { name: "Jack B. Nimble",  'goto': 'Jail',  grade: 'A',  format: { type: 'rect',  width: 1920,  height: 1080,  interlace: false,  framerate: 24 } };
Object Literals myFunction({ type: 'rect',  width: 1920,  height: 1080 }); throw { name: 'error',  message: 'out of bounds' };
Object Literals ,[object Object],[object Object]
Object Augmentation ,[object Object],[object Object],[object Object],[object Object],[object Object]
Linkage ,[object Object],[object Object],[object Object],[object Object]
Linkage var myNewObject = object(myOldObject); myNewObject myOldObject 3 "level" "A" "grade" "Jail" "goto" "Jack B. Nimble" "name"
Linkage myNewObject.name = "Tom Piperson"; myNewObject.level += 1; myNewObject.crime = 'pignapping'; "pignapping" "crime" 4 "level" "Tom Piperson" "name" 3 "level" "A" "grade" "Jail" "goto" "Jack B. Nimble" "name"
Inheritance ,[object Object],[object Object]
Prototypal Inheritance ,[object Object],[object Object],[object Object],[object Object],[object Object]
Prototypal Inheritance ,[object Object],[object Object],[object Object],[object Object]
Object Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Object Construction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Reference ,[object Object],[object Object],[object Object],[object Object],[object Object]
Delete ,[object Object],[object Object]
Arrays ,[object Object],[object Object],[object Object],[object Object],[object Object]
length ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Array Literals ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Array Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Deleting Elements ,[object Object],[object Object],[object Object],[object Object]
Deleting Elements ,[object Object],[object Object],[object Object],[object Object],[object Object]
Arrays v Objects ,[object Object],[object Object],[object Object]
Distinguishing Arrays ,[object Object],[object Object],[object Object]
Arrays and Inheritance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Functions ,[object Object],[object Object],[object Object]
Function operator ,[object Object],[object Object],[object Object],[object Object],[object Object]
lambda ,[object Object],[object Object],[object Object]
Function statement ,[object Object],[object Object],[object Object],[object Object]
Inner functions ,[object Object],[object Object]
Scope ,[object Object],[object Object]
Closure ,[object Object],[object Object]
Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Function Objects ,[object Object],[object Object]
Method ,[object Object],[object Object]
Invocation ,[object Object],[object Object],[object Object]
Invocation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Method form ,[object Object],[object Object],[object Object]
Function form ,[object Object],[object Object],[object Object],[object Object],[object Object]
Constructor form ,[object Object],[object Object],[object Object]
this ,[object Object],[object Object],[object Object],the new object constructor the object method the global object function this Invocation form
arguments ,[object Object],[object Object],[object Object],[object Object]
Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Augmenting Built-in Types ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
trim String.prototype.trim = function () { return this.replace( /^*(*(++)*)*$/, "$1");  };
supplant ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
supplant ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
typeof ,[object Object],'undefined' undefined 'object' null 'boolean' boolean 'string' string 'number' number 'object' array 'function' function 'object' object typeof type
eval ,[object Object],[object Object],[object Object],[object Object]
Function function ,[object Object],[object Object],[object Object],[object Object]
Built-in Type Wrappers ,[object Object],[object Object],[object Object],[object Object],[object Object]
Confession ,[object Object],[object Object],[object Object],[object Object],[object Object]
Augmentation ,[object Object],[object Object],[object Object]
Working with the Grain ,[object Object],[object Object]
(global) Object ,[object Object],[object Object],[object Object],[object Object],[object Object]
Global variables are evil ,[object Object],[object Object],[object Object]
Implied Global ,[object Object],[object Object],[object Object],[object Object]
Namespace ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Encapsulate ,[object Object],[object Object]
Example YAHOO.Trivia = function () { // define your common vars here // define your common functions here return { getNextPoser: function (cat, diff) { ... }, showPoser: function () { ... } }; } ();
Thinking about type ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Date ,[object Object],[object Object]
RegExp ,[object Object],[object Object],[object Object],[object Object],[object Object]
Threads ,[object Object],[object Object],[object Object],[object Object]
Platforms ,[object Object],[object Object],[object Object],[object Object],[object Object]
ActionScript ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
E4X ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ECMAScript Fourth Edition ,[object Object],[object Object],[object Object],[object Object]
Style ,[object Object],[object Object],[object Object],[object Object],[object Object]
Style and JavaScript ,[object Object],[object Object],[object Object]
Code Conventions for the JavaScript Programming Language http://javascript.crockford.com/code.html
Semicolon insertion ,[object Object],[object Object],[object Object],[object Object]
Line Ending ,[object Object],[object Object],[object Object]
Comma ,[object Object],[object Object],[object Object],[object Object]
Required Blocks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Forbidden Blocks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Variables ,[object Object],[object Object]
Expression Statements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
switch  Statement ,[object Object],[object Object]
Assignment Expressions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
== and != ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Labels ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
JSLint ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
UHOH! ,[object Object],[object Object],[object Object],[object Object]
Key Ideas ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The JavaScript Programming Language Douglas Crockford [email_address] produce.yahoo.com/crock/javascript.ppt

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Javascript by Yahoo

  • 1. The JavaScript Programming Language Douglas Crockford
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  • 3. The World's Most Misunderstood Programming Language
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  • 56. Object Literals var myObject = {name: "Jack B. Nimble", 'goto': 'Jail', grade: 'A', level: 3}; var theName = myObject.name; var destination = myObject['goto']; 3 "level" "A" "grade" "Jail" "goto" "Jack B. Nimble" "name"
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  • 58. Object Literals var myObject = {name: "Jack B. Nimble", 'goto': 'Jail', grade: 'A', format: {type: 'rect', width: 1920, height: 1080, interlace: false, framerate: 24} };
  • 59. Object Literals var myObject = { name: "Jack B. Nimble", 'goto': 'Jail', grade: 'A', format: { type: 'rect', width: 1920, height: 1080, interlace: false, framerate: 24 } };
  • 60. Object Literals myFunction({ type: 'rect', width: 1920, height: 1080 }); throw { name: 'error', message: 'out of bounds' };
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  • 64. Linkage var myNewObject = object(myOldObject); myNewObject myOldObject 3 "level" "A" "grade" "Jail" "goto" "Jack B. Nimble" "name"
  • 65. Linkage myNewObject.name = "Tom Piperson"; myNewObject.level += 1; myNewObject.crime = 'pignapping'; "pignapping" "crime" 4 "level" "Tom Piperson" "name" 3 "level" "A" "grade" "Jail" "goto" "Jack B. Nimble" "name"
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  • 101. trim String.prototype.trim = function () { return this.replace( /^*(*(++)*)*$/, "$1"); };
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  • 116. Example YAHOO.Trivia = function () { // define your common vars here // define your common functions here return { getNextPoser: function (cat, diff) { ... }, showPoser: function () { ... } }; } ();
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  • 127. Code Conventions for the JavaScript Programming Language http://javascript.crockford.com/code.html
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  • 142. The JavaScript Programming Language Douglas Crockford [email_address] produce.yahoo.com/crock/javascript.ppt