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JavaScript Treehouse Club: JavaScript Car Sounds Changing Keywords

Posted by Santiago Sendon
Santiago Sendon
831 Points

why does the second b in bikeBell have to be capitalized?

i got it right but i have been wondering why

index.html 
<!DOCTYPE html>
<html lang="en">

  <head>
  <meta name="charset" value="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=0.5, maximum-scale=0.5, minimal-ui">
    <title>Car Sounds</title>

    <!--Style Sheet link-->
    <link rel="stylesheet" type="text/css" href="css/style.css">
  </head>

  <body>

    <!--Car image -->
    <img src="images/bike.png" class="car" alt="car">


    <!--Button-->
    <a href="javascript:startCar();"><img src="images/bikeLock.png" alt="key"></a>


    <!--Audio Files-->
    <audio id="bikeBell" src="sounds/bikeBell.mp3" preload="auto"></audio>


    <!--Javascript-->
    <script type="text/javascript">
        function bikeBell() {
            document.getElementById('bikeBell').play();
        }

    </script>

  </body>

</html>

2 Answers

Jennifer Nordell
seal-mask
STAFF
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher
Jennifer Nordell
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher

If you're asking why they write it that way in general, it's a convention called camel case and fairly common among programmers across programming languages. It's much easier to read myReallyLongVariable than myreallylongvariable.

If you mean why specifically bikeBell has to be written so in the getElementById section it's because that's also the name of the ID. Obviously, they have to match for it to work.

Santiago Sendon
Santiago Sendon
831 Points
Santiago Sendon
Santiago Sendon
831 Points

thanks jennifer ive read up more on camel case. I wasnt aware of such a thing but yes makes complete sense now thanks you agaion