src/error.js

import { Monad } from "./monad";
/**
 * Class ErrorM - return given value or produce Error if take Error or get Error after execution of f(v).
 * @extends {Monad}
 */
export class ErrorM extends Monad {
    /**
     * Chains the operations on a monadic values.
     * @method bind
     * @param {function(v: T) => Pr<U>} f - transformation function for a monad.
     * @param {any} v - underlying value for a monad.
     * @return {Pr<U>  | Error} transformed by f() value v or Error.
     */
    bind(f, v) {
        if (v !== v || v === Infinity || v === -Infinity || v instanceof Error) {
            return this.fail(v);
        }
        else {
            const vL = this.just(f, v);
            return (vL !== vL || vL === Infinity || vL === -Infinity || vL instanceof Error) ? this.fail(vL) : vL;
        }
    }
}
//Copyright (c) 2017 Alex Tranchenko. All rights reserved.