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JavaScript JavaScript Loops, Arrays and Objects Tracking Multiple Items with Arrays Two-Dimensional Arrays

Posted by David Loder
David Loder
4,987 Points

I have the code written as shown but cannot get it displayed onto the page. Can anyone debug for me?

This should be the code. Is there anything I'm missing? I need a second pair of eyes. var playLists = [ ['I Did It My Way', 'Frank Sinatra'], ['Respect', 'Aretha Franklin'], ['Imagine', 'John Lennon'], ['Born to Run', 'Bruce Springsteen'], ['Louie Louie', 'The Kingsmen'], ['Maybellene', 'Chuck Berry'] ];

function print(message) { document.write(message); }

function printSongs( songs ) { var listHTML = '<ol>'; for ( var i = 0; i < songs.length; i += 1) { listHTML += '<li>' + songs[i][0] + ' by ' + songs[i][1] + '</li>'; } listHTML += '</ol>'; print(listHTML); }

printSongs(playList);

2 Answers

KRIS NIKOLAISEN
KRIS NIKOLAISEN
54,972 Points

If you run it through the console you'll see:

Uncaught ReferenceError: playList is not defined

This

printSongs(playList);

should be

printSongs(playLists);
David Loder
David Loder
4,987 Points

Thanks Kris. I would have never caught that.

Laura Owens
Laura Owens
15,044 Points
Laura Owens
Laura Owens
15,044 Points

I'm using Atom for my text editor. On the last segment, I had a similar error. My code wouldn't run because one of the many "playLists" variables was missing a capital L.

In Atom, when you click on one variable, it highlights all uses of the same variable.

I got the error in the console, but couldn't find it in my code. That's how I discovered the clicking on one and seeing all of the uses thang.

Hope that helps in the future!