indexBy.js

import { path } from './path'

function indexByPath(pathInput, list){
  const toReturn = {}
  for (let i = 0; i < list.length; i++){
    const item = list[ i ]
    toReturn[ path(pathInput, item) ] = item
  }

  return toReturn
}

export function indexBy(condition, list){
  if (arguments.length === 1){
    return _list => indexBy(condition, _list)
  }

  if (typeof condition === 'string'){
    return indexByPath(condition, list)
  }

  const toReturn = {}
  for (let i = 0; i < list.length; i++){
    const item = list[ i ]
    toReturn[ condition(item) ] = item
  }

  return toReturn
}