9 lines
251 B
JavaScript
9 lines
251 B
JavaScript
function differenceBy(firstArr, secondArr, mapper) {
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const mappedSecondSet = new Set(secondArr.map(item => mapper(item)));
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return firstArr.filter(item => {
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return !mappedSecondSet.has(mapper(item));
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});
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}
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export { differenceBy };
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