All files / patterns/iterator/src iterator.ts

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export interface IteratorInterface<Element> {
    next(): Element | null;
    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(): Element | null {
        let result = null;
 
        if (this.hasNext()) {
            result = this.collection[this.position];
            this.position += 1;
        }
 
        return result;
    }
 
    public hasNext(): boolean {
        return this.position < this.collection.length;
    }
}