sequency/lib/foldIndexed.js

Functional sequences for processing iterable data in JavaScript

Object.defineProperty(exports, "__esModule", { value: true });
exports.FoldIndexed = void 0;
var FoldIndexed = /** @class */ (function () {
    function FoldIndexed() {
    }
    /**
     * 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 as well as the `index` of the current element (zero-based) until all elements of the sequence
     * are processed.
     *
     * @param {R} initial
     * @param {(index: number, acc: R, element: T) => R} operation
     * @returns {R}
     */
    FoldIndexed.prototype.foldIndexed = function (initial, operation) {
        var result = initial;
        var index = 0;
        for (var item = this.iterator.next(); !item.done; item = this.iterator.next()) {
            result = operation(index, result, item.value);
            index++;
        }
        return result;
    };
    return FoldIndexed;
}());
exports.FoldIndexed = FoldIndexed;
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