iteragain/dist/esm/internal/ConcatIterator.js

Javascript Iterable/Iterator/Generator-function utilities.

/** An iterator that concatenates other iterators together, in the order they are in the `iterators` arg. */
export class ConcatIterator {
    constructor(iterators) {
        this.iterators = iterators;
    }
    [Symbol.iterator]() {
        return this;
    }
    next(...args) {
        if (!this.iterators.length)
            return { done: true, value: undefined };
        const next = this.iterators[0].next(...args);
        if (!next.done)
            return next;
        this.iterators.shift();
        return this.next(...args);
    }
}
export default ConcatIterator;
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