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subSet javascript Code Snippet in 2022

arrayintermediate

Last Updated: 25 September 2022

Checks if the first iterable is a subset of the second one, excluding duplicate values.

  • Use the new Set() constructor to create a new Set object from each iterable.
  • Use Array.prototype.every() and Set.prototype.has() to check that each value in the first iterable is contained in the second one.
const subSet = (a, b) => { const sA = new Set(a), sB = new Set(b); return [...sA].every(v => sB.has(v)); };
subSet(new Set([1, 2]), new Set([1, 2, 3, 4])); // true subSet(new Set([1, 5]), new Set([1, 2, 3, 4])); // false

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