11 lines
252 B
JavaScript
11 lines
252 B
JavaScript
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export default function uniqueBy(arr, fn) {
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var identifiers = new Set();
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return arr.filter(function (item) {
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var identifier = fn(item);
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if (!identifiers.has(identifier)) {
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identifiers.add(identifier);
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return true;
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}
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});
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}
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