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JavaScript map initialize with values | Code

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You can use the Map() constructor to map initialize with values in JavaScript. You have to pass arrays of key-value pairs, where the first element in the array is the key and the second – is the value.

JavaScript map initialize with values

Simple example code Each key-value pair is added to the new Map. We passed a two-dimensional array to the Map() constructor to initialize it with values.

Let’s see how to create a Map from Object and array.

<!DOCTYPE html>
  <script >
    // Create Map from Array
    const map1 = new Map([
      ['country', 'Chile'],
      ['name', 'Tom'],


    // Create Map from Object
    const obj = {name: 'Tom', country: 'Chile'};
    const map2 = new Map(Object.entries(obj));




JavaScript map initialize with values

Use the Object.entries method to create a map from an object.

const obj = {name: 'Tom', country: 'Chile'};

// [['name', 'Tom'], ['country', 'Chile']]

Do comment if you have any doubts or suggestions on this Js map basic code.

Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.

OS: Windows 10

Code: HTML 5 Version

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