iteragain/dist/esm/internal/ChunksIterator.js

Javascript Iterable/Iterator/Generator-function utilities.

/** An iterator that yields non-overlapping values in chunks (tuples) of a certain `size`. */
export class ChunksIterator {
    constructor(iterator, length, fill) {
        this.iterator = iterator;
        this.length = length;
        this.fill = fill;
        this.done = false;
        this.chunk = [];
        if (length <= 0)
            throw new RangeError('length must be greater than 0');
    }
    [Symbol.iterator]() {
        return this;
    }
    next(...args) {
        if (this.done)
            return { done: true, value: undefined };
        for (let i = 0; i < this.length; i++) {
            const next = this.iterator.next(...args);
            if (next.done) {
                this.done = true;
                if (this.chunk.length) {
                    if (this.fill !== undefined) {
                        this.chunk = this.chunk.concat(Array.from({ length: this.length - this.chunk.length }, _ => this.fill));
                    }
                    break;
                }
                return { done: true, value: undefined };
            }
            this.chunk.push(next.value);
        }
        return { done: false, value: this.chunk.splice(0, this.length) };
    }
}
export default ChunksIterator;
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