Haskell-style monads in JavaScript (ES6).

gistfile1.js

'use strict';

class Monad {
  constructor(a) { this._value = a; }
  '>>='(f) { return f(this.value()); }
  static create(a) { return new Monad(a); }
  value() { return this._value; }
}

var val = Monad.create(10) ['>>=']
  (x => Monad.create(x*x) ['>>=']
    (x => Monad.create(x - 42) ['>>=']
      (x => Monad.create(x + 3)) ))

  .value();

console.log(val);