Set
from b
to get the unique values in b
.Array.prototype.filter()
on a
to only keep values not contained in b
, using Set.prototype.has()
.const difference = (a, b) => {
const s = new Set(b);
return a.filter(x => !s.has(x));
};
difference([1, 2, 3, 3], [1, 2, 4]); // [3, 3]
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