Monad in javascript.

monad.js

function MONAD(modifier) {
    var prototype = Object.create(null);
    function unit(value) {
        var monad = Object.create(prototype);
        monad.bind = function (func, args) {
            return func.apply(undefined,
                              [value].concat(Array.prototype.slice.apply(args || [])));
        };
        if (typeof modifier == 'function') {
            monad = modifier(monad, value);
        }
        return monad;
    };

    unit.method = function (name, func) {
        prototype[name] = func;
        return unit;
    };

    unit.lift = function (name, func) {
        prototype[name] = function (args) {
            return unit(this.bind(func, args));
        };
        return unit;
    };
    return unit;
}


var identity = MONAD()
        .lift('print', function(n) {console.log("Id", n);})
        .lift('asNumber', function(n) { return Number(n); });

var m = identity("Hello World");


m.bind(console.log);

m.print();

var m2 = identity("250.100");

m2.asNumber().print();

console.log(m2)

var maybe = MONAD(funcion(monad, value) {
    if (value == null) {
        monad.bind = funcion () { return monad; };
    }
    return monad;
};