Continuation monad in Javascript

Cont.js

function Cont(contHandler) {
  this.contHandler = contHandler;
};

Cont.unit = function(value) {
  return new Cont(function (continue) { return continue(value); });
};

Cont.prototype.run = function(resume) {
  return this.contHandler(resume);
};

Cont.prototype.escape = function() {
  return this.run(function(x) { return x; });
};

Cont.prototype.doNothing = function () {
  var self = this;
  return new Cont(function(resume) { 
    return self.run(function(value) { 
      return resume(value); 
    }); 
  });
};

Cont.prototype.doNothing = function () {
  var self = this;
  return new Cont(function(resume) { return self.run(resume); });
};

Cont.prototype.bind = function (transform) {
  var self = this;
  return new Cont(function(resume) { 
    return self.run(function (value) { 
      return transform(value).run(resume); 
    });
  });
};

// > Cont.unit(3).bind(function(x) { return Cont.unit(4).bind(function (y) { return Cont.unit(x + y); }); }).escape();