iteragain/dist/cjs/internal/PairwiseIterator.js

Javascript Iterable/Iterator/Generator-function utilities.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.PairwiseIterator = void 0;
/** An iterator that pairs adjacent values in the input `Iterator<T>` together like: [T, T] */
class PairwiseIterator {
    constructor(iterator) {
        this.iterator = iterator;
        this.prev = null;
    }
    [Symbol.iterator]() {
        return this;
    }
    next(...args) {
        if (!this.prev && (this.prev = this.iterator.next(...args)).done)
            return { done: true, value: undefined };
        const next = this.iterator.next(...args);
        if (next.done)
            return { done: true, value: undefined };
        const value = [this.prev.value, next.value];
        this.prev = next;
        return { done: false, value };
    }
}
exports.PairwiseIterator = PairwiseIterator;
exports.default = PairwiseIterator;
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