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JavaScript Callback Functions in JavaScript Introduction to Callback Functions Creating an Anonymous Callback Function

Julianna Kahn
Julianna Kahn
20,702 Points
Posted by Julianna Kahn
Julianna Kahn
20,702 Points

I keep getting the answer: Bummer: The callback still has a name! But the code does work.

I've seen other answers posted for this but I still don't find anything that works.

app.js 
function log() {
  console.log("Hello World!");
}

functionRunner(log);
index.html 
<!DOCTYPE html>
<html lang="en">
    <head>
        <title></title>
        <link rel='stylesheet' href='styles.css'>
    </head>
    <body>
        <section>
            <p>Open your browser's console to see the results</p>
        </section>
        <script src='runner.js'></script>
        <script src='app.js'></script>
    </body>
</html>
runner.js 
function functionRunner(callback) { 
  callback();
}

functionRunner(() => console.log("Hello World") );

2 Answers

mersadajan
mersadajan
21,306 Points

You forgot the exclamation mark "!" in your string. Running your code with the added exclamation mark works for me.

Julianna Kahn
Julianna Kahn
20,702 Points
Julianna Kahn
Julianna Kahn
20,702 Points

You're right about the exclamation point so I added that, but I still get the same error message. And you're right, it does work. It seems they are looking for a different format of sorts.

BTW, the question is: In the app.js file, functionRunner executes a callback, log. Convert log in to an anonymous function and pass the anonymous function directly into functionRunner.

Then I also tried this:

functionRunner(() => console.log("Hello World!"));

Same error message.

mersadajan
mersadajan
21,306 Points

The code is correct, but I see you added it to runner.js, why? The change should happen in app.js.

Julianna Kahn
Julianna Kahn
20,702 Points
Julianna Kahn
Julianna Kahn
20,702 Points

I thought I would try using that file since it was there and nothing else worked. But you are right, when I tried my revised version of the answer, it did finally work. Thanks for your help.

mersadajan
mersadajan
21,306 Points

Yay, happy that it worked out! 💪