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

Adam Maley
Adam Maley
5,946 Points
Posted by Adam Maley
Adam Maley
5,946 Points

; question about this

var temperatures = [100,90,99,80,70,65,30,10];

for (var i = 0; i < temperatures.length; i += 1) { console.log(temperatures[i]);

}

Why is this correct but this

var temperatures = [100,90,99,80,70,65,30,10];

for (var i = 0; i < temperatures.length; i += 1;) { console.log(temperatures[i]);

}

Is not correct...The ; after i +=1;

1 Answer

Steven Parker
Steven Parker
220,925 Points
Steven Parker
Steven Parker
220,925 Points

Inside the "for" expression, the semicolons are separators between clauses, not delimiters. Adding an extra semicolon implies that there is a 4th clause, which is not proper syntax.