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intersection javascript Code Snippet in 2023

arrayintermediate

Last Updated: 1 March 2023

Returns the elements that exist in both arrays, filtering duplicate values.

  • Create a Set from b, then use Array.prototype.filter() on a to only keep values contained in b.
const intersection = (a, b) => { const s = new Set(b); return [...new Set(a)].filter(x => s.has(x)); };
intersection([1, 2, 3], [4, 3, 2]); // [2, 3]

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