1/** 2 * Copyright (c) 2021-2022 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 class CheckEmptyUtils{ 17 18 /** 19 * Check obj is empty. 20 * 21 * @param {any} obj 22 * @return {boolean} true(empty) 23 */ 24 static isEmpty(obj: any): boolean { 25 return (typeof obj === 'undefined' || obj == null || obj === ''); 26 } 27 28 /** 29 * Check str is empty. 30 * 31 * @param {string} str 32 * @return {boolean} true(empty) 33 */ 34 static checkStrIsEmpty(str: string): boolean { 35 return str == undefined || str == null || str.trim().length == 0; 36 } 37 38 /** 39 * Check array is empty. 40 * 41 * @param {Array} arr An array to check if is empty. 42 * @return {boolean} true(empty) 43 */ 44 static isEmptyArr<T>(arr: T[]): boolean { 45 return arr == undefined || arr == null || arr.length == 0; 46 } 47}