Utility
_Promise
说明
模拟实现
ES6 的 Promise源码
用法
_Promise.test.ts
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describe('ES6Achieve._Promise tests', () => {
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const _Promise = ES6Achieve._Promise;
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test('_Promise should work fine', () => {
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const result1 = new _Promise((resolve) => {
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setTimeout(() => {
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resolve(1);
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}, 0);
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});
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result1.then((value) => {
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expect(value).toBe(1);
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return value + 1;
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}).then((value) => {
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expect(value).toBe(2);
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});
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const result2 = new _Promise((resolve) => {
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resolve(100);
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});
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result2.then((value) => {
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expect(value).toBe(100);
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return value / 5;
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}).then((value) => {
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expect(value).toBe(20);
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});
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});
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});
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