const simpleObj = { a: [1, 2, 3], b: {c: {d: 42}} }; const map = new Map(Object.entries(simpleObj)); console.log(Object.fromEntries([...map])); This fails for complex nested maps, however. For …

Jun 19, 2021 · You can use console.log in a map like this: const array1 = [1, 4, 9, 16]; const map1 = array1.map((x) => { console.log(x); return x * 2; }); You are using a shorthand return :

Apr 2, 2025 · const kvArray = [ ["key1", "value1"], ["key2", "value2"], ]; // Use the regular Map constructor to transform a 2D key-value Array into a map const myMap = new Map(kvArray); …

Dec 19, 2020 · let myMap = new Map(); for (let i = 1; i < 10; i++) { myMap.set(i, i * 10); } console.log("Full list of contacts:"); for (let [key, value] of myMap) { console.log(key + " = " + …

Sep 30, 2022 · As with the Set, Map only logs directly, not when combined in a template literal. The solution is to convert Sets and Maps to arrays before logging out. The following code …

Jan 18, 2024 · Explore how to create and use Map objects, and the differences they bring when compared to regular JavaScript objects. When working with JavaScript, developers often …

Create JavaScript Map. To create a Map, we use the new Map() constructor. For example, // create a Map const map1 = new Map(); // an empty map console.log(map1); // Map {}

A Map is a built in object that holds key-value pairs. It can hold a key of any data type unlike in plain objects. It maintains the insertion order and provides helpers to manage key-value pairs.

Javascript maps are a great way to store data, and in many instances are more performant than Objects. Let's look at how they work.

Nov 10, 2021 · console.log can be more convenient - it depends on the situation and your preferred debugging workflow. Let's say we want to log obj inside this .map () function here: …