foop/src/deps/loop/map/mapObjKeys.js

interfaces that describe their intentions.

const ObjectKeys = require('../../util/keys')
const toObj = require('../../cast/toObj')

/**
 * The opposite of `mapValue` this method creates an object with the
 * same values as `object` and keys generated by running each own enumerable
 * string keyed property of `object` thru `iteratee`. The iteratee is invoked
 * with three arguments: (value, key, object).
 * @since 5.0.0-beta.6
 * @memberOf loop
 * @alias mapObjKeys
 *
 * @param {Object} object The object to iterate over.
 * @param {Function} iteratee The function invoked per iteration.
 * @return {Object} Returns the new mapped object.
 *
 * @fork 3.8.0
 * @category Object
 *
 * @see mapValue
 *
 * @example
 *
 *   var concatKey = (value, key) => key + value)
 *   mapKey({ 'a': 1, 'b': 2 }, concatKey)
 *   //=> { 'a1': 1, 'b2': 2 }
 *
 */
function mapObjKey(object, iteratee) {
  const obj = toObj(object)
  const result = {}

  const keys = ObjectKeys(obj)
  for (let i = 0; i < keys.length; i++) {
    const key = keys[i]
    const value = obj[key]
    result[iteratee(value, key, obj)] = value
  }
  return result
}

module.exports = mapObjKey