js map constructor
let myMap = new Map([
[1, 'one'], // [key, value]
[2, 'two'],
[3, 'three'],
]) // from MDNjs map constructor
let myMap = new Map([
[1, 'one'], // [key, value]
[2, 'two'],
[3, 'three'],
]) // from MDNjavascript 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 }; });javascript map
function listFruits() {
let fruits = ["apple", "cherry", "pear"]
fruits.map((fruit, index) => {
console.log(index, fruit)
})
}
listFruits()
// https://jsfiddle.net/tmoreland/16qfpkgb/3/array map javascript
const array1 = [1, 4, 9, 16];
// pass a function to map
const map1 = array1.map(x => x * 2);
console.log(map1);
// expected output: Array [2, 8, 18, 32]How does map works in javascript?
const products = [
{ name: 'Laptop', price: 32000, brand: 'Lenovo', color: 'Silver' },
{ name: 'Phone', price: 700, brand: 'Iphone', color: 'Golden' },
{ name: 'Watch', price: 3000, brand: 'Casio', color: 'Yellow' },
{ name: 'Aunglass', price: 300, brand: 'Ribon', color: 'Blue' },
{ name: 'Camera', price: 9000, brand: 'Lenovo', color: 'Gray' },
];
const productName = products.map(product => product.name);
console.log(productName);
//Expected output:[ 'Laptop', 'Phone', 'Watch', 'Aunglass', 'Camera' ]new map js
let utilisateurs = new Map()
utilisateurs.set('Mark Zuckerberg' ,{
email: '[email protected]',
poste: 'PDG',
})
utilisateurs.set ('bill Gates',{
email: '[email protected]' ,
poste : 'sauver le monde' ,
})
console.log(utilisateurs);Copyright © 2021 Codeinu
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