/**
 * 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 3.8.0
 * @category Object
 * @param {Object} object The object to iterate over.
 * @param {Function} iteratee The function invoked per iteration.
 * @returns {Object} Returns the new mapped object.
 * @see mapValue
 * @example
 *
 * mapKey({ 'a': 1, 'b': 2 }, function(value, key) {
 *   return key + value
 * })
 * // => { 'a1': 1, 'b2': 2 }
 */
function mapKey(object, iteratee) {
  object = Object(object)
  const result = {}

  Object.keys(object).forEach((key) => {
    const value = object[key]
    result[iteratee(value, key, object)] = value
  })
  return result
}

export default mapKey