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indexOfAll javascript Code Snippet in 2022

arrayintermediate

Last Updated: 28 December 2022

Finds all indexes of val in an array. If val never occurs, returns an empty array.

  • Use Array.prototype.reduce() to loop over elements and store indexes for matching elements.
const indexOfAll = (arr, val) => arr.reduce((acc, el, i) => (el === val ? [...acc, i] : acc), []);
indexOfAll([1, 2, 3, 1, 2, 3], 1); // [0, 3] indexOfAll([1, 2, 3], 4); // []

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