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 JavaScript Loops, Arrays and Objects Tracking Data Using Objects Using `for in` to Loop Through an Object's Properties

console.log difference between , and +

In this video he used the ,(comma) to concatenate strings to each other instead of +. What's the difference between the two? When would I use + or ,?

1 Answer

The function console.log is set up to loop and print each argument passed to it, one after another. If they were pluses, it would be sending one long argument to the function instead of three short ones. It's not technically concatenation, but the end result is the same.

With the +, console.log() prints the 'skills' section as a joined list. Whereas, with the comma, it prints an array. So the end result isn't quite the same.