asia-weex-vue-render4light/src/utils/type.js

Web renderer for weex project written in Vue DSL.

/*
 * 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.
 */

const toString = Object.prototype.toString

/**
 * Strict object type check. Only returns true
 * for plain JavaScript objects.
 *
 * @param {*} obj
 * @return {Boolean}
 */
const OBJECT_STRING = '[object Object]'
export function isPlainObject (obj) {
  return toString.call(obj) === OBJECT_STRING
}

const ARRAY_STRING = '[object Array]'
export function isArray (arr) {
  return toString.call(arr) === ARRAY_STRING
}

export function isPrimitive (val) {
  return typeof value === 'string'
    || typeof value === 'number'
    || typeof value === 'symbol'
    || typeof value === 'boolean'
}

export function isDef (val) {
  return val !== undefined && val !== null
}