16 lines
452 B
JavaScript
16 lines
452 B
JavaScript
function intersectionBy(firstArr, secondArr, mapper) {
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const result = [];
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const mappedSecondSet = new Set(secondArr.map(mapper));
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for (let i = 0; i < firstArr.length; i++) {
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const item = firstArr[i];
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const mappedItem = mapper(item);
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if (mappedSecondSet.has(mappedItem)) {
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result.push(item);
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mappedSecondSet.delete(mappedItem);
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}
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}
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return result;
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}
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export { intersectionBy };
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