iteragain/dist/esm/internal/ZipLongestIterator.js

Javascript Iterable/Iterator/Generator-function utilities.

export class ZipLongestIterator {
    constructor(iterators) {
        this.iterators = iterators;
        this.done = new Set();
    }
    [Symbol.iterator]() {
        return this;
    }
    next(...args) {
        const values = [];
        for (let i = 0; i < this.iterators.length; i++) {
            if (!this.done.has(i)) {
                const next = this.iterators[i].next(...args);
                if (next.done)
                    this.done.add(i);
                values.push(next.value);
            }
            else
                values.push(undefined);
        }
        if (values.length === this.done.size)
            return { done: true, value: undefined };
        return { value: values, done: false };
    }
}
export default ZipLongestIterator;
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