iteragain/dist/esm/internal/CycleIterator.js

Javascript Iterable/Iterator/Generator-function utilities.

import toIterator from '../toIterator';
/**
 * Cycles through the input `iterator`'s values a certain number of `times`. So when the input iterator is done, the
 * next iterator result will cycle back to the first value of the input iterator.
 */
export class CycleIterator {
    constructor(iterator, times) {
        this.iterator = iterator;
        this.times = times;
        this.values = [];
    }
    [Symbol.iterator]() {
        return this;
    }
    next(...args) {
        const next = this.iterator.next(...args);
        if (next.done) {
            if (!this.values.length || this.times-- <= 0)
                return next;
            this.iterator = toIterator(this.values.splice(0, this.values.length));
            return this.next(...args);
        }
        this.values.push(next.value);
        return next;
    }
}
export default CycleIterator;
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