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 Multiple Items with Arrays Iterating through an Array

Posted by Mustafa Khan
Mustafa Khan
6,224 Points

what is my mistake

I can't find out my mistake

script.js 
var temperatures = [100,90,99,80,70,65,30,10];
for (var i = 0; var i < temperatures.length; var i ++){
  console.log(temperatures[i]);
}
index.html 
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript Loops</title>
</head>
<body>
<script src="script.js"></script>
</body>
</html>

1 Answer

andren
andren
28,558 Points
andren
andren
28,558 Points

The var keyword is only used when creating a variable, you should not use it when referencing an existing one.

So you should only use it when you first declare the i variable. Like this:

var temperatures = [100,90,99,80,70,65,30,10];
for (var i = 0; i < temperatures.length; i++) {
  console.log(temperatures[i]);
}