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Answers for "Map Javascript - Example"

TypeScript
35

javascript map function

const posts = [
  { id: 1, title: "Sample Title 1", description: "Lorem ipsum dolor sit amet, consectetur adipiscing elit..." },
  { id: 2, title: "Sample Title 2", description: "Lorem ipsum dolor sit amet, consectetur adipiscing elit..." },
  { id: 3, title: "Sample Title 3", description: "Lorem ipsum dolor sit amet, consectetur adipiscing elit..." },
];
// ES2016+
// Create new array of post IDs. I.e. [1,2,3]
const postIds = posts.map((post) => post.id);
// Create new array of post objects. I.e. [{ id: 1, title: "Sample Title 1" }]
const postSummaries = posts.map((post) => ({ id: post.id, title: post.title }));

// ES2015
// Create new array of post IDs. I.e. [1,2,3]
var postIds = posts.map(function (post) { return post.id; });
// Create new array of post objects. I.e. [{ id: 1, title: "Sample Title 1" }]
var postSummaries = posts.map(function (post) { return { id: post.id, title: post.title }; });
Posted by: Guest on October-01-2020
0

map javascript

var miMapa = new Map();

var claveObj = {},
    claveFunc = function () {},
    claveCadena = "una cadena";

// asignando valores
miMapa.set(claveCadena, "valor asociado con 'una cadena'");
miMapa.set(claveObj, "valor asociado con claveObj");
miMapa.set(claveFunc, "valor asociado with claveFunc");

miMapa.size; // 3

// obteniendo los valores
miMapa.get(claveCadena);    // "valor asociado con 'una cadena'"
miMapa.get(claveObj);       // "valor asociado con claveObj"
miMapa.get(claveFunc);      // "valor asociado con claveFunc"

miMapa.get("una cadena");   // ""valor asociado con 'una cadena'"
                         // porque claveCadena === 'una cadena'
miMapa.get({});           // undefined, porque claveObj !== {}
miMapa.get(function() {}) // undefined, porque claveFunc !== function () {}

var myMap = new Map();
myMap.set("bar", "foo");

myMap.delete("bar"); // Retorna true. Eliminado con éxito.
myMap.has("bar");    // Retorna false. El elemento "bar" ya no está presente.
Posted by: Guest on February-11-2021
0

Map Javascript - Example

let contacts = new Map()
contacts.set('Jessie', {phone: "213-555-1234", address: "123 N 1st Ave"})
contacts.has('Jessie') // true
contacts.get('Hilary') // undefined
contacts.set('Hilary', {phone: "617-555-4321", address: "321 S 2nd St"})
contacts.get('Jessie') // {phone: "213-555-1234", address: "123 N 1st Ave"}
contacts.delete('Raymond') // false
contacts.delete('Jessie') // true
console.log(contacts.size) // 1
Posted by: Guest on January-21-2021

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