Maybe monad

// is it a monad?
var x = 1,
    fn = x => x + 1,
    gn = x => x * 2

var law1 = new Maybe(x).bind(fn).return() == new Maybe(fn(x)).return()
console.log(law1)

var law2 = new Maybe(x).bind(x => x).return() == new Maybe(x).return()
console.log(law2)

var law3 = new Maybe(x).bind(fn).bind(gn).return() ===
           new Maybe(x).bind(x => gn(fn(x))).return()
console.log(law3)