Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

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

call back

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

functionRunner(log);

app.js
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();
}
Steven Parker
Steven Parker
231,248 Points

This looks like a duplicate of the other question you posted a few minutes ago. See the answer(s) posted there.

You can delete this duplicate while it has no answers, click the small rectangle with the 3 dots to reveal the option.