Function copyElement

test/angular/1.4/angular.js:946–991

(source)

  }

  function copyElement(source) {
    // Simple values
    if (!isObject(source)) {
      return source;
    }

    // Already copied values
    var index = stackSource.indexOf(source);
    if (index !== -1) {
      return stackDest[index];
    }

    if (isWindow(source) || isScope(source)) {
      throw ngMinErr('cpws',
        "Can't copy! Making copies of Window or Scope instances is not supported.");
    }

    var needsRecurse = false;
    var destination;

    if (isArray(source)) {
      destination = [];
      needsRecurse = true;
    } else if (isTypedArray(source)) {
      destination = new source.constructor(source);
    } else if (isDate(source)) {
      destination = new Date(source.getTime());
    } else if (isRegExp(source)) {
      destination = new RegExp(source.source, source.toString().match(/[^\/]*$/)[0]);
      destination.lastIndex = source.lastIndex;
    } else if (isBlob(source)) {
      destination = new source.constructor([source], {type: source.type});
    } else if (isFunction(source.cloneNode)) {
        destination = source.cloneNode(true);
    } else {
      destination = Object.create(getPrototypeOf(source));
      needsRecurse = true;
    }

    stackSource.push(source);
    stackDest.push(destination);

    return needsRecurse
      ? copyRecurse(source, destination)
      : destination;
  }
}

/**