html5/render/browser/utils/array.js

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */
'use strict'

export function isArray (arr) {
  return Array.isArray
    ? Array.isArray(arr)
    : (Object.prototype.toString.call(arr) === '[object Array]')
}

export function slice (arr, start, end) {
  if (isArray(arr)) {
    return arr.slice(start, end)
  }
  const slice = Array.prototype.slice
  return slice.call(arr, start, end)
}