src/asyncFlow.js

import { Maybe } from "./maybe";
import { ErrorM } from "./error";
import { clone } from "./services/clone";
import { Monad } from "./monad";
/**
 * Class AsyncFlow - for composing monads in an async flow (pipe), based on Promise.
 * @extends {Monad}
 */
export class AsyncFlow extends Monad {
    /**
     * Creates an instance of class AsyncFlow.
     * @param {any} [initV = 0] initV - initial value of new flow (pipe).
     * @param {boolean} [encapsulate = true] encapsulate - flag, if true then the init value will be cloned.
     */
    constructor(initV = 0, encapsulate = true) {
        super();
        /**
         * Keep initial flow (pipe) value.
         * @type {any}
         */
        this.flow = encapsulate ? clone(initV) : initV;
        /**
         * The instance of Maybe.
         * @type {Maybe}
         */
        this.maybe = new Maybe();
        /**
         * The instance of ErrorM.
         * @type {ErrorM}
         */
        this.err = new ErrorM();
    }
    /**
     * Binds initial value to the transformation function.
     * @method bind
     * @param {function(v: T) => Pr<U>} f - transformation function.
     * @return {Promise<T>}
     */
    bind(f) {
        return new Promise((resolve) => {
            resolve(this.err.bind(v => this.maybe.bind((v) => f(v), v), this.flow));
        });
    }
}
//Copyright (c) 2017 Alex Tranchenko. All rights reserved.