mapObject javascript Code Snippet in 2025
arrayobjectintermediate
Last Updated: 13 November 2025
Maps the values of an array to an object using a function.
- Use
Array.prototype.reduce()to applyfnto each element inarrand combine the results into an object. - Use
elas the key for each property and the result offnas the value.
const mapObject = (arr, fn) => arr.reduce((acc, el, i) => { acc[el] = fn(el, i, arr); return acc; }, {});
mapObject([1, 2, 3], a => a * a); // { 1: 1, 2: 4, 3: 9 }
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