iteragain/dist/es5/internal/ProductIterator.js

Javascript Iterable/Iterator/Generator-function utilities.

import toArray from '../toArray';
/** Returns the cartesian product of the input `iterators`. */
var ProductIterator = /** @class */ (function () {
    function ProductIterator(iterators, repeat) {
        var _a;
        this.done = false;
        this.pools = [];
        this.i = 0;
        var iterated = iterators.map(toArray);
        for (var i = 0; i < repeat; i++)
            (_a = this.pools).push.apply(_a, iterated);
        this.indices = new Array(this.pools.length).fill(0);
    }
    ProductIterator.prototype[Symbol.iterator] = function () {
        return this;
    };
    ProductIterator.prototype.next = function () {
        var _this = this;
        if (this.done)
            return { done: true, value: undefined };
        var value = this.indices.map(function (v, i) { return _this.pools[i][v]; });
        for (this.i = 0; this.i < this.indices.length; this.i++) {
            if (this.indices[this.pools.length - this.i - 1] < this.pools[this.pools.length - this.i - 1].length - 1) {
                this.indices[this.pools.length - this.i - 1]++;
                break;
            }
        }
        if (this.i === this.indices.length) {
            this.done = true;
            return { done: false, value: value };
        }
        this.i--;
        while (this.i >= 0) {
            this.indices[this.pools.length - this.i - 1] = 0;
            this.i--;
        }
        return { done: false, value: value };
    };
    return ProductIterator;
}());
export { ProductIterator };
export default ProductIterator;
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