import forIn from "./forIn"
import has from "./has"

/**
 * Renames a set of keys in a given object (removing the old ones)
 *
 * @function
 * @name renameKeys
 * @param {object} keyMap An object whose keys are the _current_ key names and whose values are the _new_ key names
 * @param {object} obj An Object whose keys will be renamed
 * @returns {object} A new Object that has all the specified keys renamed to their new names
 */
function renameKeys(keyMap, obj) {
  const newObj = {}
  forIn((key, val) => {
    if (has(key, keyMap)) {
      newObj[keyMap[key]] = val
    } else {
      newObj[key] = val
    }
  }, obj)
  return newObj
}

export default renameKeys