/
filter.js
50 lines (40 loc) · 979 Bytes
/
filter.js
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import { isArray } from './_internals/isArray.js'
export function filterObject(predicate, obj){
const willReturn = {}
for (const prop in obj){
if (predicate(
obj[ prop ], prop, obj
)){
willReturn[ prop ] = obj[ prop ]
}
}
return willReturn
}
export function filterArray(
predicate, list, indexed = false
){
let index = 0
const len = list.length
const willReturn = []
while (index < len){
const predicateResult = indexed ?
predicate(list[ index ], index) :
predicate(list[ index ])
if (predicateResult){
willReturn.push(list[ index ])
}
index++
}
return willReturn
}
export function filter(predicate, iterable){
if (arguments.length === 1)
return _iterable => filter(predicate, _iterable)
if (!iterable){
throw new Error('Incorrect iterable input')
}
if (isArray(iterable)) return filterArray(
predicate, iterable, false
)
return filterObject(predicate, iterable)
}