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JavaScript - convert array of objects to hash map (indexed by property value)

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Created by:

Lani-Skinner

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In this article, we would like to show you how to convert an array of objects to a hash map in JavaScript.

Quick solution (ES6+):

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const array = [{ key: 1, value: 'a' }, { key: 2, value: 'b' }];
​
const result = array.reduce((map, object) => ((map[object.key] = object.value), map), {});
​
console.log(JSON.stringify(result)); // { '1': 'a', '2': 'b' }

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Practical example

Edit

In this example, we use reduce() method to convert an array of objects into a hash map containing key/value pairs created with property values.

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var array = [
    { key: 1, value: 'a' },
    { key: 2, value: 'b' }
];
​
var result = array.reduce(function(map, object) {
    map[object.key] = object.value;
    return map;
}, {});
​
console.log(JSON.stringify(result)); // { '1': 'a', '2': 'b' }