when to use map in javascript code example
Example 1: 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..." },
];
const postIds = posts.map((post) => post.id);
const postSummaries = posts.map((post) => ({ id: post.id, title: post.title }));
var postIds = posts.map(function (post) { return post.id; });
var postSummaries = posts.map(function (post) { return { id: post.id, title: post.title }; });
Example 2: javascript map function
let array = [1, 4, 9, 16];
array.map(num => num * 2);
array.map(pounds => `£${pounds}.00`);
array.map(item => Math.sqrt(item));
Example 3: map in js
const data = {name: "laptop", brands: ["dell", "acer", "asus"]}
let inside_data = data.brands.map((i) => {
console.log(i);
});
Example 4: javascript map
const array1 = [1, 4, 9, 16];
const map1 = array1.map(x => x * 2);
console.log(map1);
Example 5: javascript map
array.map( item => item.id )
array2.map( item => item.toString() )
array2.map( item => item * 3 )
Example 6: map function javascript
var rebels = pilots.filter(function (pilot) { return pilot.faction === "Rebels";});var empire = pilots.filter(function (pilot) { return pilot.faction === "Empire";});