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