You're almost done, but some of that code you started out with is a little messy. Now that you understand more of how functions work, you can clean it all up. You're going to create a pair of functions to replace all the code in the “my-script.js” file. First, make a function called loadSongsToPage () and cut and paste the three lines inside the nameless (anonymous) function that's in whenSongsReadyDo () so that your file looks like this:

 getSongs('U2', 3)

 function loadSongsToPage (){
   var mySongs = getSongTitlesAndArtists()
   displaySongsList(mySongs)
   setupPlayer()
 }

 whenSongsReadyDo(
   function(){

   }
 )

Next, replace the anonymous function with your new one, like so:

 whenSongsReadyDo(loadSongsToPage)

That looks a little neater and is a bit clearer about what's going on. Because the functions are well named, you can read what's happening almost like a sentence.

Now, wrap everything up in a function called putMusicOnThePage () like this:

function loadSongsToPage (){
 var mySongs = getSongTitlesAndArtists()
 displaySongsList(mySongs)
 setupPlayer()
 }

function putMusicOnThePage (){
  getSongs('U2', 3)
  whenSongsReadyDo(loadSongsToPage())
}

putMusicOnThePage()

Load the HTML page and check it all still works. It's nice, but you can make it even better. Just add a couple of parameters to your putMusicOnThePage () function for the search query and the number of songs, like so:

 function putMusicOnThePage (query, songCount){
   getSongs(query, songCount)
   whenSongsReadyDo(loadSongsToPage)
 }

 putMusicOnThePage('U2', 3)

Your code still does the same thing, but now any programmer can come along and use it to put music on the page without needing to worry about exactly how that works. They just write one line and it appears! You've been doing this all along, with your functions calling the functions we wrote together (like displaySongsList ()) and calling my functions. You didn't need to know how mine worked, you just need to know what to give them and what to expect them to return.

That's the real power of functions in programing—you break up the pieces so things can happen or change inside one piece (or one programer's work) without the other pieces (or programers) needing to know or care as long as the same information going into a function still leads to the same effects coming out.

This is amazingly powerful and you'll see it in the rest of the Sushi Cards. You'll also be able to do it yourself if you try working with other Ninjas in your Dojo on a project together: You can write your own functions, in your own .js files and, as long as you've all planned in advance what input should get what output, you should be able to use each other's code by combining them in one HTML file like you did back on the first card in this series!