com.google.javascript.jscomp.js.es6.util.restarguments.js Maven / Gradle / Ivy

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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

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/*
 * Copyright 2021 The Closure Compiler Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @fileoverview Provides a method to return the rest arguments from a
 * function's arguments. Should be called using `apply`, using the start index
 * as the value for `this` and the original function's arguments array as the
 * arguments, to avoid issues with V8 function optimization backoff cause by
 * passing arguments around as a function parameter (apply is special-cased).
 *
 * @suppress {reportUnknownTypes, uselessCode}
 */

'require base';

/**
 * @this {number}
 * @return {!Array}
 * @noinline
 */
$jscomp.getRestArguments = function() {
  var startIndex = Number(this);
  var restArgs = [];
  for (var i = startIndex; i < arguments.length; i++) {
    restArgs[i - startIndex] = arguments[i];
  }
  return restArgs;
};