Este documento resume los principales métodos de arrays en JavaScript para separar, unir, transformar, buscar, filtrar, añadir, eliminar y extraer elementos. Explica brevemente el uso y propósito de métodos como concat(), filter(), map(), join(), split() y otros.
Aprende desde cero a utilizar REDIS, una base de datos NoSQL que destaca por su alto rendimiento y velocidad, además de su sencillez. REDIS es ideal para casi cualquier tarea, pero especialmente en entornos críticos de consultas y de monitorización.
Redis is an open source in memory database which is easy to use. In this introductory presentation, several features will be discussed including use cases. The datatypes will be elaborated, publish subscribe features, persistence will be discussed including client implementations in Node and Spring Boot. After this presentation, you will have a basic understanding of what Redis is and you will have enough knowledge to get started with your first implementation!
PostgreSQL Tutorial For Beginners | EdurekaEdureka!
YouTube Link: https://youtu.be/-VO7YjQeG6Y
** MYSQL DBA Certification Training https://www.edureka.co/mysql-dba **
This Edureka PPT on PostgreSQL Tutorial For Beginners (blog: http://bit.ly/33GN7jQ) will help you learn PostgreSQL in depth. You will also learn how to install PostgreSQL on windows. The following topics will be covered in this session:
What is DBMS
What is SQL?
What is PostgreSQL?
Features of PostgreSQL
Install PostgreSQL
SQL Command Categories
DDL Commands
ER Diagram
Entity & Attributes
Keys in Database
Constraints in Database
Normalization
DML Commands
Operators
Nested Queries
Set Operations
Special Operators
Aggregate Functions
Limit, Offset & Fetch
Joins
Views
Procedures
Triggers
DCL Commands
TCL Commands
Export/ Import Data
UUID Datatype
Follow us to never miss an update in the future.
YouTube: https://www.youtube.com/user/edurekaIN
Instagram: https://www.instagram.com/edureka_learning/
Facebook: https://www.facebook.com/edurekaIN/
Twitter: https://twitter.com/edurekain
LinkedIn: https://www.linkedin.com/company/edureka
Castbox: https://castbox.fm/networks/505?country=in
최고의 속도와 미션 크리티컬 업무를 수행하기 위한, 'In-Memory-Computing 글로벌 리더 GridGain 솔루션' 을 소개합니다. 그리드 게인은 데이터 집약적인 애플리케이션을 분산 컴퓨팅을 통해 가속화하고 확장하는 인메모리 컴퓨팅 플랫폼 솔루션입니다. www.all-dt4u.com/
[주요 특성]
1.속도 : 메모리에 데이터를 로드(Load)하여 최대 백만배 빠른 속도
2.확장성 : 분산 및 병렬 처리로 비즈니스 로직 전체 실행 시간 감소
3. 디지털 트렌스포메이션 : 메모리 집약적인 아키텍쳐 기반으로 신속한 접근과 처리 가능
4. 중앙 집중식 관리 : 클러스터 실시간 모니터링 및 특정 이벤트 발생 시 알림 기능
5. 고객에 최적화된 통합 : RDBMS, NoSQL, 하둡 등 데이터베이스와 통합 가능
"GridGain은 오픈소스 Apache Ignite 기반의 In-Memory Computing 플랫폼으로, 웹 규모 애플리케이션, SaaS 및 클라우드 Conputing, 모바일 및 IoT 백엔드, 실시간 데이터 처리, 빅데이터 분석 등 분야에 성능 향상을 지원 합니다. "
It contains a comprehensive list of questions commonly asked during Java interviews. It includes questions on topics such as object-oriented programming, multi-threading, collections, garbage collection, memory management, exception handling, and much more.
Aprende desde cero a utilizar REDIS, una base de datos NoSQL que destaca por su alto rendimiento y velocidad, además de su sencillez. REDIS es ideal para casi cualquier tarea, pero especialmente en entornos críticos de consultas y de monitorización.
Redis is an open source in memory database which is easy to use. In this introductory presentation, several features will be discussed including use cases. The datatypes will be elaborated, publish subscribe features, persistence will be discussed including client implementations in Node and Spring Boot. After this presentation, you will have a basic understanding of what Redis is and you will have enough knowledge to get started with your first implementation!
PostgreSQL Tutorial For Beginners | EdurekaEdureka!
YouTube Link: https://youtu.be/-VO7YjQeG6Y
** MYSQL DBA Certification Training https://www.edureka.co/mysql-dba **
This Edureka PPT on PostgreSQL Tutorial For Beginners (blog: http://bit.ly/33GN7jQ) will help you learn PostgreSQL in depth. You will also learn how to install PostgreSQL on windows. The following topics will be covered in this session:
What is DBMS
What is SQL?
What is PostgreSQL?
Features of PostgreSQL
Install PostgreSQL
SQL Command Categories
DDL Commands
ER Diagram
Entity & Attributes
Keys in Database
Constraints in Database
Normalization
DML Commands
Operators
Nested Queries
Set Operations
Special Operators
Aggregate Functions
Limit, Offset & Fetch
Joins
Views
Procedures
Triggers
DCL Commands
TCL Commands
Export/ Import Data
UUID Datatype
Follow us to never miss an update in the future.
YouTube: https://www.youtube.com/user/edurekaIN
Instagram: https://www.instagram.com/edureka_learning/
Facebook: https://www.facebook.com/edurekaIN/
Twitter: https://twitter.com/edurekain
LinkedIn: https://www.linkedin.com/company/edureka
Castbox: https://castbox.fm/networks/505?country=in
최고의 속도와 미션 크리티컬 업무를 수행하기 위한, 'In-Memory-Computing 글로벌 리더 GridGain 솔루션' 을 소개합니다. 그리드 게인은 데이터 집약적인 애플리케이션을 분산 컴퓨팅을 통해 가속화하고 확장하는 인메모리 컴퓨팅 플랫폼 솔루션입니다. www.all-dt4u.com/
[주요 특성]
1.속도 : 메모리에 데이터를 로드(Load)하여 최대 백만배 빠른 속도
2.확장성 : 분산 및 병렬 처리로 비즈니스 로직 전체 실행 시간 감소
3. 디지털 트렌스포메이션 : 메모리 집약적인 아키텍쳐 기반으로 신속한 접근과 처리 가능
4. 중앙 집중식 관리 : 클러스터 실시간 모니터링 및 특정 이벤트 발생 시 알림 기능
5. 고객에 최적화된 통합 : RDBMS, NoSQL, 하둡 등 데이터베이스와 통합 가능
"GridGain은 오픈소스 Apache Ignite 기반의 In-Memory Computing 플랫폼으로, 웹 규모 애플리케이션, SaaS 및 클라우드 Conputing, 모바일 및 IoT 백엔드, 실시간 데이터 처리, 빅데이터 분석 등 분야에 성능 향상을 지원 합니다. "
It contains a comprehensive list of questions commonly asked during Java interviews. It includes questions on topics such as object-oriented programming, multi-threading, collections, garbage collection, memory management, exception handling, and much more.
Unirest is lightweight HTTP request client libraries available in multiple languages including Java, .NET, Ruby, Node, Objective-C, etc.
https://interviewbubble.com/unirest-java-tutorial/
Video available here: http://vivu.tv/portal/archive.jsp?flow=783-586-4282&id=1270584002677
We all know that MongoDB is one of the most flexible and feature-rich databases available. In this webinar we'll discuss how you can leverage this feature set and maintain high performance with your project's massive data sets and high loads. We'll cover how indexes can be designed to optimize the performance of MongoDB. We'll also discuss tips for diagnosing and fixing performance issues should they arise.
Provides an overview of Redis which is a Key Value NoSQL database and the different data types it supports. Also shows how to use Redis Client API from node.
Integrating Xtext Language Server support in Visual Studio CodeKarsten Thoms
This presentation was given at the Eclipse DemoCamp November 2016 in Bonn. It explained the new Microsoft Language Server Protocol and its implementation in Xtext. Finally the structure of an extension package for VS Code is shown which contains an Xtext DSL and runs a language server.
What is JavaScript?
JavaScript is a very powerful client-side scripting language. JavaScript is used mainly for enhancing the interaction of a user with the webpage. In other words, you can make your webpage more lively and interactive, with the help of JavaScript. JavaScript is also being used widely in game development and Mobile application development.
※다운로드하시면 더 선명한 자료를 보실 수 있습니다.
동접 200만 명이 접속할 수백 대의 게임 서버가 최소한의 MySQL 서버만으로 서비스할 수 있는 구조를 설명합니다.
고성능/고효율의 MySQL 스케일링 기법을 공유합니다. 대규모 게임 서비스에서 이미 검증된 것은 안 비밀~
목차
1. 기본적인 아기텍처
2. ProxySQL을 이용한 더 나은 아키텍처
3. 최종 아키텍처
대상
- 대규모 게임 서비스에 MySQL을 사용한 경험에 관심 있는 분
- ProxySQL에 관심이 있는 서버 개발자 혹은 DBA
- 게임 서버 개발 과정에서 DB 쪽을 유연하게 구성하고 싶은 분
■관련 동영상: https://youtu.be/8Eb_n7JA1yA
Unirest is lightweight HTTP request client libraries available in multiple languages including Java, .NET, Ruby, Node, Objective-C, etc.
https://interviewbubble.com/unirest-java-tutorial/
Video available here: http://vivu.tv/portal/archive.jsp?flow=783-586-4282&id=1270584002677
We all know that MongoDB is one of the most flexible and feature-rich databases available. In this webinar we'll discuss how you can leverage this feature set and maintain high performance with your project's massive data sets and high loads. We'll cover how indexes can be designed to optimize the performance of MongoDB. We'll also discuss tips for diagnosing and fixing performance issues should they arise.
Provides an overview of Redis which is a Key Value NoSQL database and the different data types it supports. Also shows how to use Redis Client API from node.
Integrating Xtext Language Server support in Visual Studio CodeKarsten Thoms
This presentation was given at the Eclipse DemoCamp November 2016 in Bonn. It explained the new Microsoft Language Server Protocol and its implementation in Xtext. Finally the structure of an extension package for VS Code is shown which contains an Xtext DSL and runs a language server.
What is JavaScript?
JavaScript is a very powerful client-side scripting language. JavaScript is used mainly for enhancing the interaction of a user with the webpage. In other words, you can make your webpage more lively and interactive, with the help of JavaScript. JavaScript is also being used widely in game development and Mobile application development.
※다운로드하시면 더 선명한 자료를 보실 수 있습니다.
동접 200만 명이 접속할 수백 대의 게임 서버가 최소한의 MySQL 서버만으로 서비스할 수 있는 구조를 설명합니다.
고성능/고효율의 MySQL 스케일링 기법을 공유합니다. 대규모 게임 서비스에서 이미 검증된 것은 안 비밀~
목차
1. 기본적인 아기텍처
2. ProxySQL을 이용한 더 나은 아키텍처
3. 최종 아키텍처
대상
- 대규모 게임 서비스에 MySQL을 사용한 경험에 관심 있는 분
- ProxySQL에 관심이 있는 서버 개발자 혹은 DBA
- 게임 서버 개발 과정에서 DB 쪽을 유연하게 구성하고 싶은 분
■관련 동영상: https://youtu.be/8Eb_n7JA1yA
Javascript no para de expandirse y avanzar. Y ahora, con la llegada de EcmaScript 6, ciertos workflows y la forma de escribir código va a cambiar. Ahora los javascripters vamos a tener más herramientas en nuestras manos. Ya hay frameworks populares como Angular que sus futuras versiones vendrán en EcmaScript 6. ¿Porqué no hecharle un vistazo al futuro?
Charla impartida por Luis Calvo en la última edición de Codemotion (Madrid, Spain - Nov 21-22)
3. JS
El método estático Array.isArray() verifica si el argumento pasado es una
matriz o no.
$ node index.js
TERMINAL
true
false
const numbers = [1, 2, 3, 4];
console.log(Array.isArray(numbers));
const text = "JavaScript";
console.log(Array.isArray(text));
index.js
4. JS
El método Array.of() crea una instancia de Array (la diferencia con el
constructor es como maneja los parámetros de tipo entero).
$ node index.js
TERMINAL
[7]
[1, 2, 3]
[undefined, undefined,
undefined, undefined,
undefined, undefined,
undefined]
[1, 2, 3]
const arr1 = Array.of(7);
console.log(arr1);
const arr2 = Array.of(1, 2, 3);
console.log(arr2);
const arr3 = Array(7);
console.log(arr3);
const arr4 = Array(1, 2, 3);
console.log(arr4);
index.js
5. JS
El método .concat() devuelve la unión de dos o más matrices
(no modifica las matrices involucradas).
$ node index.js
TERMINAL
"superman"
"aquaman"
"batman"
"flash"
"deadpool"
"hulk"
"wolverine"
"ironman"
const heroesDC = [
"superman", "aquaman", "batman","flash"
];
const heroesMarvel = [
"deadpool", "hulk", "wolverine", "ironman"
];
const multiverso = heroesDC.concat(
heroesMarvel);
multiverso.forEach(heroe => {
console.log(heroe)
});
index.js
6. index.js
El método .every() devuelve true si todos los elementos cumplen la
condición en la función.
$ node index.js
TERMINAL
false
true
const arrNumbers1 = [10, 20, 55.33, 23];
const arrNumbers2 = [2, 4, 6, 8, 10, 12];
function numberIsEven(num) {
return Math.round(num) % 2 === 0;
}
console.log(arrNumbers1.every(numberIsEven)
);
console.log(arrNumbers2.every(numberIsEven)
);
JS
7. index.js
$ node index.js
TERMINAL
const numbers = [10, 20, 55.33, 23];
const n = numbers.entries(num);
for (let x of n) {
console.log(x);
}
El método .entries() devuelve un objeto [Array Iterator] con pares
clave/valor
[0, 10]
[1, 20]
[2, 55.33]
[3, 23]
JS
8. index.js
El método .filter() crea una nueva matriz con los elementos que
cumplen una condición.
$ node index.js
TERMINAL
const numbers = [10, 20, 55.33, 23];
function numberIsEven(num) {
return Math.round(num) % 2 === 0;
}
const pares = numbers.filter(numberIsEven);
console.log(pares);
[10, 20]
JS
9. index.js
$ node index.js
TERMINAL
const heroes = [
"superman",
"aquaman",
"batman",
"ironman"
];
const batman = heroes.find(hero => {
return hero === "batman"
});
console.log(batman);
El método .find() devuelve el valor del primer elemento que cumple
una condición.
"batman"
JS
10. index.js
$ node index.js
TERMINAL
const heroes = [
"superman",
"aquaman",
"batman",
"ironman",
"batwoman"
];
const heroe = heroes.findLast(hero => {
return hero.startsWith("b");
});
console.log(heroe);
El método .findLast() devuelve el valor del elemento que cumple una
condición, pero buscando elementos desde derecha a izquierda.
"batwoman"
JS
11. index.js
$ node index.js
TERMINAL
const heroes = [
"superman",
"aquaman",
"batman",
"ironman"
];
const index = heroes.findIndex(hero => {
return hero === "batman"
});
console.log(index);
El método .findIndex() devuelve el valor de la posición en la matriz
del primer elemento que cumple una condición.
2
JS
12. index.js
$ node index.js
TERMINAL
const heroes = [
"superman",
"aquaman",
"batman",
"ironman",
"batwoman"
];
const index = heroes.findLastIndex(hero => {
return hero.startsWith("b");
});
console.log(index);
El método .findIndexLast() devuelve el valor de la posición en la matriz del
elemento que cumple una condición, pero buscando desde derecha a izquierda.
4
JS
13. index.js
$ node index.js
TERMINAL
const numbers = [10, 20, 55.33, 23];
numbers.shift();
numbers.forEach((num, index) => {
console.log(`${index}, ${num}`)
});
El método .shift() elimina el primer elemento de la matriz y cambia
todos los demás elementos a un índice más bajo.
"0, 20"
"1, 55.33"
"2, 34"
JS
14. index.js
El método .some() devuelve true si al menos uno de los elementos
cumplen la condición en la función callback.
$ node index.js
TERMINAL
true
false
const arrNumbers1 = [10, 20, 55.33, 23];
const arrNumbers2 = [1, 3, 5, 9, 11, 13];
function numberIsEven(num) {
return Math.round(num) % 2 === 0;
}
console.log(arrNumbers1.some(numberIsEven));
console.log(arrNumbers2.some(numberIsEven));
JS
15. index.js
$ node index.js
TERMINAL
const heroes = [
"superman",
"aquaman",
"batman",
"ironman"
];
heroes.unshift("flash", "spider-man");
heroes.forEach(heroe => {
console.log(heroe)
});
El método .unshif() agrega nuevos elementos al comienzo de la matriz
(sobrescribe la original).
JS
"flash"
"spider-man"
"superman"
"aquaman"
"batman"
"ironman"
16. index.js
$ node index.js
TERMINAL
const heroes = [
"superman",
"aquaman",
"batman",
"ironman"
]
heroes.sort()
.forEach(heroe => {
console.log(heroe)
});
El método .sort() ordena los elementos como cadenas en orden
alfabético y ascendente
JS
"aquaman"
"batman"
"ironman"
"superman"
17. index.js
$ node index.js
TERMINAL
const numbers = [10, 20, 55.33, 23];
function getSum(total, num) {
return total + Math.round(num);
}
const total = numbers.reduce(getSum, 0);
console.log(total);
El método .reduce() devuelve un único valor; el resultado acumulado
de la función reductora.
JS
108
18. index.js
$ node index.js
TERMINAL
const numbers = [95, 5, 25, 10, 25];
const result = numbers.reduceRight((first, second) => {
console.log(`F=${first} S=${second}`);
return first - second;
});
console.log(result);
El método .reduceRight() devuelve un único valor; el resultado acumulado de la
función reductora (acumulando el valor de derecha a izquierda).
JS
"F=25 S=10"
"F=15 S=25"
"F=-10 S=5"
"F=-15 S=95"
- 110
19. index.js
$ node index.js
TERMINAL
const heroesDC = [
"batgirl",
"green arrow",
"catwoman",
"shazam"
];
console.log(heroesDC.pop());
heroesDC.forEach(hero =>
console.log(hero));
El método .pop elimina un elemento de la matriz
(el del final, devuelve el elemento eliminado).
"shazam"
"batgirl"
"green arrow"
"catwoman"
JS
20. index.js
$ node index.js
TERMINAL
const heroesDC = [
"batgirl",
"green arrow",
"catwoman",
"shazam"
];
heroesDC.push("literna verde",
"mujer maravilla");
heroesDC.forEach(hero =>
console.log(hero));
El método .push() agrega un nuevo elemento a una matriz
(al final, sobrescribe la original).
"batgirl"
"green arrow"
"catwoman"
"shazam"
"literna verde"
"mujer maravilla"
JS
21. index.js
$ node index.js
TERMINAL
const heroesDC = [
"batgirl",
"green arrow",
"catwoman",
"shazam"
];
heroesDC.splice(2, 1,
"literna verde", "mujer maravilla")
heroesDC.forEach(hero =>
console.log(hero));
El método .splice() se utiliza para agregar nuevos elementos a una
matriz (indicando su posición y cantidad de elementos a eliminar)
(modifica la matriz original).
JS
"batgirl"
"green arrow"
"literna verde"
"mujer maravilla"
"shazam"
22. index.js
$ node index.js
TERMINAL
const heroes = [
"batgirl",
"green arrow",
"catwoman",
"shazam",
"capitán américa",
"iron man",
"batman"
];
const heroesMarvel = heroes.slice(4, 6);
heroesMarvel.forEach(hero =>
console.log(hero));
El método .slice() se utiliza para extraer parte de una matriz, toma
dos argumentos la posición de un elemento de inicio y hasta un
elemento final (no incluye el elemento final).
JS
"capitán américa"
"iron man"
23. index.js
$ node index.js
TERMINAL
const heroes = [
"batgirl",
"green arrow",
"catwoman",
"shazam",
"capitán américa",
"iron man",
"batman"
];
const longitudNombres = heroes.map((nombre) =>
nombre.length
);
for (let n of longitudNombres) {
console.log(parseInt(n));
}
El método .map() se utiliza para transformar una matriz, llama una función una
vez para cada elemento de la matriz y así crea una matriz nueva
(no modifica la matriz original, no ejecuta la función en elementos vacíos).
JS
7
11
8
6
15
8
6
24. index.js
$ node index.js
TERMINAL
const letras = ["a","b","c","d"];
const unidosPorPunto = letras.join(".");
const unidosPorFlecha = letras.join("->");
console.log(unidosPorPunto);
console.log(unidosPorFlecha);
El método .join() se utiliza para crear un string con todos los elementos de
una matriz, uniéndolo por el texto que le pasemos por parámetro.
JS
"a.b.c.d"
"a->b->c->d"
25. index.js
$ node index.js
TERMINAL
const splitLetras = "a.b.c".split(".");
const splitDigitos = "5-4-3-2-1".split("-");
console.log(splitLetras);
console.log(splitDigitos);
El método .split() de un string es posible crear una matriz, separándolo por
el texto que le pasemos por parámetro (separador).
JS
["a", "b", "c"]
["5", "4", "3", "2", "1"]