1/* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16export default class CheckEmptyUtils { 17 /** 18 * Check obj is empty. 19 * 20 * @param {Object} obj need checked object 21 * @return {boolean} true(empty) 22 */ 23 static isEmpty(obj): boolean { 24 return ( 25 typeof obj === 'undefined' || 26 obj === null || 27 obj === '' || 28 Object.keys(obj).length === 0 29 ); 30 } 31 32 /** 33 * Check str is empty. 34 * 35 * @param {string} str need checked string 36 * @return {boolean} true(empty) 37 */ 38 static checkStrIsEmpty(str): boolean { 39 return str.trim().length === 0; 40 } 41 42 /** 43 * Check array is empty. 44 * 45 * @param {Array} arr need checked array 46 * @return {boolean} true(empty) 47 */ 48 static isEmptyArr(arr): boolean { 49 return arr.length === 0; 50 } 51} 52