7 lines
246 B
JavaScript
7 lines
246 B
JavaScript
const symmetricDifferenceBy = (a, b, fn) => {
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const sA = new Set(a.map(v => fn(v))),
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sB = new Set(b.map(v => fn(v)));
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return [...a.filter(x => !sB.has(fn(x))), ...b.filter(x => !sA.has(fn(x)))];
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};
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module.exports = symmetricDifferenceBy;
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