fabric.js/src/util/lang_object.js

(function() {

  /**
   * Copies all enumerable properties of one object to another
   * @memberOf fabric.util.object
   * @param {Object} destination Where to copy to
   * @param {Object} source Where to copy from
   * @return {Object}
   */
  function extend(destination, source) {
    // JScript DontEnum bug is not taken care of
    for (var property in source) {
      destination[property] = source[property];
    }
    return destination;
  }

  /**
   * Creates an empty object and copies all enumerable properties of another object to it
   * @memberOf fabric.util.object
   * @param {Object} object Object to clone
   * @return {Object}
   */
  function clone(object) {
    return extend({ }, object);
  }

  /** @namespace fabric.util.object */
  fabric.util.object = {
    extend: extend,
    clone: clone
  };

})();