tsoid/dist/src/promises/reduce.js

Typed functional library to deal with async operations.

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
const fail_1 = require("./fail");
/**
 * Reduce an array of elements into a value, based in an async reducer function.
 *
 * @param {function} reducerFn
 * @param {any} base
 * @param {any[]} traversable
 */
function reduce(reducerFn, base, traversable) {
    return __awaiter(this, void 0, void 0, function* () {
        if (base instanceof Error)
            return fail_1.default(base);
        try {
            let internalAccumulator = base;
            for (const item of traversable) {
                internalAccumulator = yield reducerFn(internalAccumulator, item);
                if (internalAccumulator instanceof Error)
                    return fail_1.default(internalAccumulator);
            }
            return internalAccumulator;
        }
        catch (err) {
            return fail_1.default(err);
        }
    });
}
exports.default = reduce;