indexOfAll javascript Code Snippet in 2025
arrayintermediate
Last Updated: 1 February 2025
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); // []
javascript snippet similar to indexOfAll For You in February 2025
Subscribe to our Newsletter
Subscribe to get resources directly to your inbox. You won't receive any spam! ✌️