Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

JavaScript JavaScript Loops, Arrays and Objects Tracking Multiple Items with Arrays Iterating through an Array

Sergey Filimonov
Sergey Filimonov
5,878 Points
Posted by Sergey Filimonov
Sergey Filimonov
5,878 Points

For loop won't work

The task was: Use a for or while loop to iterate through the values in the temperatures array from the first item -- 100 -- to the last -- 10. Inside the loop, log the current array value to the console.

script.js 
var temperatures = [100,90,99,80,70,65,30,10];
for(var i = 0; i < temperatures.length; i += 1) {
  console.log(i);
}
index.html 
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript Loops</title>
</head>
<body>
<script src="script.js"></script>
</body>
</html>
liam johnshon
liam johnshon
Courses Plus Student 904 Points

hey Sergey ,

var temperatures = [100,90,99,80,70,65,30,10];
for(var i = 0; i < temperatures.length; i += 1) {
  console.log(temperatures[i]); //u have to make correction here
}

2 Answers

Tobias Helmrich
Tobias Helmrich
31,602 Points
Tobias Helmrich
Tobias Helmrich
31,602 Points

Hey Sergey,

you almost got it right. But right now you're just logging out the value of i. You have to loop through and log the value of the array temperatures at the current index with the value of i. Like so:

var temperatures = [100,90,99,80,70,65,30,10];
for(var i = 0; i < temperatures.length; i += 1) {
  console.log(temperatures[i]);
}

I hope that helps, if you have further questions feel free to ask! :)

Tawny Bartlett
Tawny Bartlett
24,674 Points
Tawny Bartlett
Tawny Bartlett
24,674 Points

I haven't done this one yet but I think what you're looking for is

var temperatures = [100,90,99,80,70,65,30,10];
for(var i = 0; i < temperatures.length; i += 1) {
  console.log(temperatures[i]);
}