1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
import { clone } from './clone.js'import { curry } from './curry.js'import { has } from './has.js'import { reduce } from './reduce.js'
function reduceByFunction(  valueFn, valueAcc, keyFn, acc, elt){  const key = keyFn(elt)  const value = valueFn(has(key, acc) ? acc[ key ] : clone(valueAcc), elt)
  acc[ key ] = value
  return acc}
export function reduceByFn(  valueFn, valueAcc, keyFn, list){  return reduce(    (acc, elt) => reduceByFunction(      valueFn, valueAcc, keyFn, acc, elt    ),    {},    list  )}
export const reduceBy = curry(reduceByFn)