showing results for - " map in js"
24 May 2019
1var myObject = { 'a': 1, 'b': 2, 'c': 3 };
3Object.keys(myObject).map(function(key, index) {
4  myObject[key] *= 2;
8// => { 'a': 2, 'b': 4, 'c': 6 }
09 Jan 2019
1const posts = [
2  { id: 1, title: "Sample Title 1", description: "Lorem ipsum dolor sit amet, consectetur adipiscing elit..." },
3  { id: 2, title: "Sample Title 2", description: "Lorem ipsum dolor sit amet, consectetur adipiscing elit..." },
4  { id: 3, title: "Sample Title 3", description: "Lorem ipsum dolor sit amet, consectetur adipiscing elit..." },
6// ES2016+
7// Create new array of post IDs. I.e. [1,2,3]
8const postIds = =>;
9// Create new array of post objects. I.e. [{ id: 1, title: "Sample Title 1" }]
10const postSummaries = => ({ id:, title: post.title }));
12// ES2015
13// Create new array of post IDs. I.e. [1,2,3]
14var postIds = (post) { return; });
15// Create new array of post objects. I.e. [{ id: 1, title: "Sample Title 1" }]
16var postSummaries = (post) { return { id:, title: post.title }; });
18 May 2017
1function listFruits() {
2  let fruits = ["apple", "cherry", "pear"]
4, index) => {
5    console.log(index, fruit)
6  })
11 Mar 2016
1const array1 = [1, 4, 9, 16];
3// pass a function to map
4const map1 = => x * 2);
7// expected output: Array [2, 8, 18, 32]
09 Sep 2020
1const array = [2, 5, 9];
2let squares = => num * num);
4console.log(array); // [2, 5, 9]
5console.log(squares); // [4, 25, 81]
23 Feb 2018
1// A function which returns the last character of a given string
2function returnLast(arr) {
3  return;
6let invoiceRef = 'myinvoice01';
8console.log( returnLast(invoiceRef) );
9// Logs: '1'
11invoiceRef = 'myinvoice02';
13console.log( returnLast(invoiceRef) );
14// Logs: '2'
queries leading to this page
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