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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 31 32 33 34 35 36 37 38 39 40 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 5x 5x 5x 1x 1x 7x 7x 7x 7x 6x 6x 6x 6x 7x 7x 7x 7x 7x 7x 1x 1x 16x 16x 1x | export interface IteratorResultInterface<Element> {
value: Element | null;
done: boolean;
}
export interface IteratorInterface<Element> {
next(): IteratorResultInterface<Element>;
hasNext(): boolean;
}
export class Iterator<Element> implements IteratorInterface<Element> {
private readonly collection: Element[];
private position: number;
public constructor(collection: Element[]) {
this.collection = collection;
this.position = 0;
}
public next(): IteratorResultInterface<Element> {
let result = null;
let done = true;
if (this.hasNext()) {
result = this.collection[this.position];
this.position += 1;
done = !this.hasNext();
}
return {
value: result,
done,
};
}
public hasNext(): boolean {
return this.position < this.collection.length;
}
}
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