sequency/lib/fold.js

Functional sequences for processing iterable data in JavaScript

Object.defineProperty(exports, "__esModule", { value: true });
exports.Fold = void 0;
var Fold = /** @class */ (function () {
    function Fold() {
    }
    /**
     * Accumulates all elements of the sequence into a single result by applying the given `operation` starting with
     * the `initial` value. The result of the last operation will be passed as accumulated value to the getNext invocation
     * of the operation until all elements of the sequence are processed.
     *
     * @param {R} initial
     * @param {(acc: R, element: T) => R} operation
     * @returns {R}
     */
    Fold.prototype.fold = function (initial, operation) {
        var result = initial;
        for (var item = this.iterator.next(); !item.done; item = this.iterator.next()) {
            result = operation(result, item.value);
        }
        return result;
    };
    return Fold;
}());
exports.Fold = Fold;
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