index.js

/**
 * Module dependencies.
 */

var type;
try {
  type = require('component-type');
} catch (_) {
  type = require('type');
}

/**
 * Module exports.
 */

module.exports = clone;

/**
 * Clones objects.
 *
 * @param {Mixed} any object
 * @api public
 */

function clone(obj){
  switch (type(obj)) {
    case 'object':
      var copy = {};
      for (var key in obj) {
        if (Object.prototype.hasOwnProperty.call(obj, key)) {
          copy[key] = clone(obj[key]);
        }
      }
      return copy;

    case 'array':
      var copy = new Array(obj.length);
      for (var i = 0, l = obj.length; i < l; i++) {
        copy[i] = clone(obj[i]);
      }
      return copy;

    case 'regexp':
      // from millermedeiros/amd-utils - MIT
      var flags = '';
      flags += obj.multiline ? 'm' : '';
      flags += obj.global ? 'g' : '';
      flags += obj.ignoreCase ? 'i' : '';
      return new RegExp(obj.source, flags);

    case 'date':
      return new Date(obj.getTime());

    default: // string, number, boolean, …
      return obj;
  }
}