iteragain/dist/es5/internal/PairwiseIterator.js

Javascript Iterable/Iterator/Generator-function utilities.

/** An iterator that pairs adjacent values in the input `Iterator<T>` together like: [T, T] */
var PairwiseIterator = /** @class */ (function () {
    function PairwiseIterator(iterator) {
        this.iterator = iterator;
        this.prev = null;
    }
    PairwiseIterator.prototype[Symbol.iterator] = function () {
        return this;
    };
    PairwiseIterator.prototype.next = function () {
        var _a, _b;
        var args = [];
        for (var _i = 0; _i < arguments.length; _i++) {
            args[_i] = arguments[_i];
        }
        if (!this.prev && (this.prev = (_a = this.iterator).next.apply(_a, args)).done)
            return { done: true, value: undefined };
        var next = (_b = this.iterator).next.apply(_b, args);
        if (next.done)
            return { done: true, value: undefined };
        var value = [this.prev.value, next.value];
        this.prev = next;
        return { done: false, value: value };
    };
    return PairwiseIterator;
}());
export { PairwiseIterator };
export default PairwiseIterator;
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