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difference

JS TODO

Returns the difference between two arrays.

Create a Set from b, then use Array.prototype.filter() on a to only keep values not contained in b.

const difference = (a, b) => {
const s = new Set(b);
return a.filter((x) => !s.has(x));
};
difference([1, 2, 3], [1, 2, 4]); // [3]