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Get the intersection of arrays

Written byPhuoc Nguyen
09 May, 2020
Last updated
22 Oct, 2021
JavaScript version
const getIntersection = (a, ...arr) => [...new Set(a)].filter((v) => arr.every((b) => b.includes(v)));
TypeScript version
const getIntersection = <T,_>(a: T[], ...arr: T[][]): T[] => [...new Set(a)].filter((v) => arr.every((b) => b.includes(v)));
getIntersection([1, 2, 3], [2, 3, 4, 5]); // [2, 3]
getIntersection([1, 2, 3], [2, 3, 4, 5], [1, 3, 5]); // [3]

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