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| ## 1.0.0 (2019-11-15) | ||
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| * feat: 1 init project, 2 add jest, typescript; 3 add instanceof ([14e4bdc](https://github.com/Rain120/awesome-code-implementation/commit/14e4bdc)) | ||
| * Initial commit ([f49c21c](https://github.com/Rain120/awesome-code-implementation/commit/f49c21c)) | ||
| * feat: 1 init project, 2 add jest, typescript; 3 add instanceof ([14e4bdc](https://github.com/Rain120/awesome-javascript-code-implementation/commit/14e4bdc)) | ||
| * Initial commit ([f49c21c](https://github.com/Rain120/awesome-javascript-code-implementation/commit/f49c21c)) | ||
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| ### 原理 | ||
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| 使用 `Object.prototype.toString` 取得对象的一个内部属性 `[[Class]]`，然后依据这个属性，返回 `"[object Array]"` 字符串作为结果(`ECMA`标准中使用`[[]]`来表示语言内部用到的、外部不可直接访问的属性，称为`内部属性`)。利用这 个方法，再配合 `call`，我们可以取得任何对象的内部属性 `[[Class]]`，然后把类型检测转化为字符串比较，以达到我们的目的。 | ||
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| ### 参考 | ||
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| [绝对准确地确定JavaScript对象是否为数组](http://web.mit.edu/jwalden/www/isArray.html) |
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| /* | ||
| * @Author: Rainy | ||
| * @Date: 2019-11-14 19:25:01 | ||
| * @LastEditors: Rainy | ||
| * @LastEditTime: 2019-11-21 19:12:43 | ||
| */ | ||
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| import { _isArray } from '.'; | ||
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| test('_isArray([]) should true', () => { | ||
| expect(_isArray([])).toBe(true); | ||
| }); | ||
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| test('_isArray([1, 2]) should true', () => { | ||
| expect(_isArray([1, 2])).toBe(true); | ||
| }); | ||
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| test('_isArray({ a: 1 }) should false', () => { | ||
| expect(_isArray({ a: 1 })).toBe(false); | ||
| }); | ||
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| test('_isArray({}) should false', () => { | ||
| expect(_isArray({})).toBe(false); | ||
| }); | ||
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| test('_isArray(null) should false', () => { | ||
| expect(_isArray(null)).toBe(false); | ||
| }); | ||
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| test('_isArray(undefined) should false', () => { | ||
| expect(_isArray(undefined)).toBe(false); | ||
| }); |
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| /* | ||
| * @Author: Rainy | ||
| * @Date: 2019-11-14 19:25:01 | ||
| * @LastEditors: Rainy | ||
| * @LastEditTime: 2019-11-21 19:08:54 | ||
| */ | ||
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| import { isAbsType } from '../../utils/type'; | ||
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| export function _isArray(target: any): boolean { | ||
| return isAbsType(target).toLowerCase() === 'array'; | ||
| } |
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| ### 原理 | ||
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| 使用一个指定的 `this` 值和单独给出的一个或多个参数来调用一个函数。 | ||
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| ### 参考 | ||
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| [call](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Function/call) |
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| /* | ||
| * @Author: Rainy | ||
| * @Date: 2019-11-21 19:02:37 | ||
| * @LastEditors: Rainy | ||
| * @LastEditTime: 2019-11-21 20:12:23 | ||
| */ | ||
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| export function isAbsType(target: any): string { | ||
| // [object Object] -> object | ||
| return Object.prototype.toString | ||
| .call(target) | ||
| .split(' ')[1] | ||
| .slice(0, -1) | ||
| .toLowerCase(); | ||
| } |
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