Question

(This question is not really restricted to the language so please feel free to submit solution in other languages too.)

I was just wondering if it would be possible to write something like this in JavaScript:

// Wait 3 seconds and then say our message in an alert box
wait(3).then(function(){alert("Hello World!");});

Where the traditional way would be to write

// Wait 3 seconds and then say our message in an alert box
setTimeout(function(){alert("Hello World!");}, 3000);

Sorry if this is a noob question :p

Answer 1

You can write it easily:

function wait(delay) {
  return {
    then: function (callback) {
      setTimeout(callback, delay*1000);
    }
  };
}

wait(3).then(function(){alert("Hello World!");});

If you want to go in-deep, I recommend you to read about currying and partial function application, those topics are really interesting.