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18 lines
377 B
18 lines
377 B
/**
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* Dedupes array based on criterion returned from iteratee function.
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* Ex: uniqueBy(
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* [{ id: 1 }, { id: 1 }, { id: 2 }],
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* val => val.id
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* ) = [{ id: 1 }, { id: 2 }]
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*/
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function uniqueBy (arr, fun) {
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const seen = {}
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return arr.filter(el => {
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const e = fun(el)
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return !(e in seen) && (seen[e] = 1)
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})
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}
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module.exports = {
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uniqueBy: uniqueBy
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}
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