You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
19 lines
377 B
19 lines
377 B
3 years ago
|
/**
|
||
|
|
* 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
|
||
|
|
}
|