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 Arrays Loop Through Arrays Search for a Value in an Array

Posted by Hanwen Zhang
Hanwen Zhang
20,084 Points

what does the "let message" works here, why there is nothing followed after this "let message" ?

Thanks

1 Answer

Peter Vann
Peter Vann
36,427 Points

Hi Hanwen!

let message;

...declares the variable "message" (literally - the memory space, which is referenced by message), without assigning it a value, which is done later in the code.

In the if else block, message is then set (assigned a value) depending on the conditions.

It's just a non-redundant way to declare a variable first when you need to later reference it in several different places.

Does that make sense?

I hope that helps.

Stay safe and happy coding!

Hanwen Zhang
Hanwen Zhang
20,084 Points

Thank you, Peter.