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

Posted by Charlie Person
Charlie Person
8,692 Points

Hmmmm- Can't quite pinpoint the parse error... Help please :)

Not sure what I'm doing wrong here!

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

while(var i < temperatures.length) {
  console.log(temperatures[i]);
  i += 1;
}
index.html 
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript Loops</title>
</head>
<body>
<script src="script.js"></script>
</body>
</html>
Michael Hernandez
Michael Hernandez
15,887 Points

Hi,

I changed your code a little bit and initialized the var outside the while as follows:

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

var i = 0; while(temperatures[i]) { console.log(temperatures[i]); i ++; }

Regards

1 Answer

Dave McFarland
STAFF
Dave McFarland
Treehouse Teacher
Dave McFarland
Dave McFarland
Treehouse Teacher

Hi Charlie Person

You can't initialize a variable inside a condition. For example this isn't correct: while (var i < temperatures.length) { but this is: while ( i < temperatures.length ) {

You should initialize the i variable outside the loop:

var temperatures = [100,90,99,80,70,65,30,10];
var i = 0;
while( i < temperatures.length) {
  console.log(temperatures[i]);
  i += 1;
}
Charlie Person
Charlie Person
8,692 Points

Hahaha!!! Oh my gosh. I cannot believe you just answered my question Dave!!!!! Treehouse is the best. Thank you so much! Totally made my week! Very clear answer as well. You're my favorite teacher. Keep on keepin' on. Hope we meet one day!