1/*
2 * Copyright (c) 2021-2023 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
16/**
17 * Object工具类
18 */
19namespace ObjectUtil {
20
21/**
22 * 判断是否为null
23 */
24  export function isNull(obj: any): boolean {
25    return obj === null;
26  }
27  /**
28   * 判断是否为undefined
29   * @param obj
30   */
31  export function isUndefined(obj: any): boolean {
32    return obj === undefined;
33  }
34  /**
35   * 判断是否为null 或者 undefined
36   * @param obj
37   */
38  export function isNullOrUndefined(obj: any): boolean {
39    return isNull(obj) || isUndefined(obj);
40  }
41
42  /**
43   * 返回string，如果是null or undefined返回defaultValue
44   */
45  export function toString(obj: any, defaultValue: string = ''): string {
46    if (this.isNullOrUndefined(obj)) {
47      return defaultValue;
48    } else {
49      return obj.toString();
50    }
51  }
52
53  /**
54   * 判断对象中是否有某个属性
55   * @param obj 校验对象
56   * @param key 校验属性
57   */
58  export function hasKey(obj: object, key: string): boolean {
59    return Object.prototype.hasOwnProperty.call(obj, key);
60  }
61}
62
63export default ObjectUtil;