sample-ap.js

class Maybe {
  constructor(val) {
    this.val = val;
  }
  ...
  ...
  //"ap" takes another "maybe" and applies the function it's holding in itself.
  //this.val MUST be a function or Nothing (and can't be some string or int)
  ap(differentMayBe) { 
     return differentMayBe.map(this.val); 
  }
}