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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | 62x 62x 7970x 7970x 19438x 19438x 19438x 19438x | import './polyfill';
/**
* Next function which returns `undefined` or a value of type `T`.
* This is used in iterators that can end with an `undefined` value, which
* indicates the end of iteration.
*/
export type UndEndNext<T> = () => undefined | T;
/**
* Creates an iterator out of {@linke UndefIterator} function.
*/
export class UndEndIterator<T> extends Iterator<T, T> implements IterableIterator<T> {
constructor(private readonly n: UndEndNext<T>) {
super();
}
public next(): IteratorResult<T, T> {
const value = this.n();
return new Res(value, value === undefined) as IteratorResult<T>;
}
}
class Res<T> {
constructor(
public readonly value: T,
public readonly done: boolean,
) {}
}
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