deep-copy-object.js: オブジェクトをディープコピー

deep-copy-object.js

/**
 * deep-copy-object.js
 *
 * Deep copy objects.
 *
 * @version 1.0.0
 * @author think49
 * @url https://gist.github.com/think49/96e8fc064b917287cadb1dfacc39695c
 * @license http://www.opensource.org/licenses/mit-license.php (The MIT License)
 */

var deepCopyObject = (function (Object, keys) {
  'use strict';

  return function deepCopyObject (target, source /* [,... source] */) {

      if (typeof target === 'undefined' || target === null) {
        throw new TypeError('Cannot convert undefined or null to object');
      }

      var len = arguments.length, i = 1;

      target = Object(target);

      while (i < len) {
        source = arguments[i++];

        if (typeof source !== 'undefined' && source !== null) {
          source = Object(source);

          for (var j = 0, sKeys = keys(source), sLen = sKeys.length, key, value; j < sLen; ++j) {
            key = sKeys[j];
            value = source[key];
            target[key] = Object(value) === value ? deepCopyObject(value) : value;
          }
        }
      }

      return target;
    };
}(Object, Object.keys));