JavaScript - map() method over Map object keys

In this article, we would like to show you how to use the map() method over Map object keys in JavaScript.

In the example below, we use:

• Array.from() method to return the result as an array,
• keys() method to get myMap keys,
• map() method to iterate over the keys and increment them

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const myMap = new Map([

    [1, 'A'],

    [2, 'B'],

    [3, 'C'],

]);

​

const result = Array.from(myMap.keys()).map((key) => {

    return key + 1;

});

​

console.log(result);

Output:

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[ 2, 3, 4 ]

1. Array.from() - JavaScript | MDN
2. Map.prototype.keys() - JavaScript | MDN
3. Array.prototype.map() - JavaScript | MDN