sequency/lib/filter.js

Functional sequences for processing iterable data in JavaScript

Object.defineProperty(exports, "__esModule", { value: true });
exports.Filter = void 0;
var Sequence_1 = require("./Sequence");
var FilterIterator = /** @class */ (function () {
    function FilterIterator(predicate, iterator) {
        this.predicate = predicate;
        this.iterator = iterator;
    }
    FilterIterator.prototype.next = function (value) {
        for (var item = this.iterator.next(); !item.done; item = this.iterator.next()) {
            if (this.predicate(item.value)) {
                return { done: false, value: item.value };
            }
        }
        return { done: true, value: undefined };
    };
    return FilterIterator;
}());
var Filter = /** @class */ (function () {
    function Filter() {
    }
    /**
     * Returns a new sequence consisting of all elements that match the given `predicate`.
     *
     * @param {(T) => boolean} predicate
     * @returns {Sequence<T>}
     */
    Filter.prototype.filter = function (predicate) {
        return (0, Sequence_1.createSequence)(new FilterIterator(predicate, this.iterator));
    };
    return Filter;
}());
exports.Filter = Filter;
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