sequency/lib/flatMap.js

Functional sequences for processing iterable data in JavaScript

Object.defineProperty(exports, "__esModule", { value: true });
exports.FlatMap = void 0;
var Sequence_1 = require("./Sequence");
var FlatMapIterator = /** @class */ (function () {
    function FlatMapIterator(transform, iterator) {
        this.transform = transform;
        this.iterator = iterator;
    }
    FlatMapIterator.prototype.next = function (value) {
        if (this.current != null) {
            var item = this.current.next();
            if (!item.done) {
                return item;
            }
        }
        var next = this.iterator.next();
        if (!next.done) {
            var sequence = this.transform(next.value);
            this.current = sequence.iterator;
            return this.next();
        }
        return { done: true, value: undefined };
    };
    return FlatMapIterator;
}());
var FlatMap = /** @class */ (function () {
    function FlatMap() {
    }
    /**
     * Transforms each element into a sequence of items and returns a flat single sequence of all those items.
     *
     * @param {(value: S) => Sequence<T>} transform
     * @returns {Sequence<T>}
     */
    FlatMap.prototype.flatMap = function (transform) {
        return (0, Sequence_1.createSequence)(new FlatMapIterator(transform, this.iterator));
    };
    return FlatMap;
}());
exports.FlatMap = FlatMap;
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