[Edit]

JavaScript - convert object to Map

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Created by:

James-Z

767

In this article, we would like to show you how to convert object to Map in JavaScript.

ES8+ solution

Edit

In this section, we present solution using Object.entries().

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const object = {
    'key1': '1',
    'key2': '2'
};
​
const map = new Map(Object.entries(object));
​
console.log(map.get('key1'));  // 1
console.log(map.get('key2'));  // 2

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Note:

Object.entries() was introduced in ECMAScript 2017 (ES8).

Alternative solution (older JavaScript)

Edit

In the example below, we get object keys using keys() method, then we iterate over the keys and add entries to a Map object using set() method.

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function toMap(object) {
    var map = new Map();
    var keys = Object.keys(object);
    for (var i = 0; i < keys.length; ++i) {
        var key = keys[i];
        map.set(key, object[key]);
    }
    return map;
}
​
​
// Usage example:
​
var object = {
    'key1': '1',
    'key2': '2'
};
​
var map = toMap(object);
​
console.log(map.get('key1'));  // 1
console.log(map.get('key2'));  // 2