Created
July 5, 2019 07:13
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| class RangeIterator implements Iterator<number> { | |
| constructor(private n: number, private to: number) {} | |
| next(): IteratorResult<number> { | |
| if (this.n <= this.to) { | |
| return { done: false, value: this.n++ }; | |
| } else { | |
| return { done: true, value: undefined }; | |
| } | |
| } | |
| } | |
| class AsyncRangeIterator implements AsyncIterator<number> { | |
| constructor(private n: number, private to: number) {} | |
| async next(): Promise<IteratorResult<number>> { | |
| await new Promise(resolve => setTimeout(resolve, 3000)); | |
| if (this.n <= this.to) { | |
| return { done: false, value: this.n++ }; | |
| } else { | |
| return { done: true, value: undefined }; | |
| } | |
| } | |
| } | |
| class MyRange { | |
| constructor(private start: number, private end: number) {} | |
| [Symbol.iterator]() { | |
| return new RangeIterator(this.start, this.end); | |
| } | |
| [Symbol.asyncIterator]() { | |
| return new AsyncRangeIterator(this.start, this.end); | |
| } | |
| } | |
| const range = new MyRange(0, 10); | |
| for (let n of range) { | |
| console.log(n); | |
| } | |
| (async () => { | |
| for await (let n of range) { | |
| console.log(n); | |
| } | |
| })(); |
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