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

Victor Gordian
Victor Gordian
4,656 Points
Posted by Victor Gordian
Victor Gordian
4,656 Points

Confused about this challenge

"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." Now at first i knew i had to put 

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

and it wouldn't let me go, so Im wondering what key term did i miss to have not thought about 1++ (which btw i don't know what '++' means) and only reason why i know its that is because i googled the question and someone had the answer. Im really confused.

Dan Johnson
Dan Johnson
40,532 Points
Dan Johnson
Dan Johnson
40,532 Points

Added code tags.

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3 Answers

Brooke Janssens
Brooke Janssens
8,090 Points
Brooke Janssens
Brooke Janssens
8,090 Points

Hi Victor,

The code I used is exactly like yours, except you're using the "greater than" symbol instead of the "less than" symbol. You have "i >temperatures.length" instead of "i < temperatures.length"

Just change that and it will work. I tested it.

Jonathan Grieve
MOD
Jonathan Grieve
Treehouse Moderator 91,252 Points
Jonathan Grieve
Jonathan Grieve
Treehouse Moderator 91,252 Points

Hi Victor,

Try changing your iteration operator from =+ to +=.

for(var i = 0; i > temperatures.length; i=+1)

At the moment you're assigning new values rather than interating through properly. :) Hope this helps

Victor Gordian
Victor Gordian
4,656 Points
Victor Gordian
Victor Gordian
4,656 Points

Oh didn't notice, but the answer overall is instead of that its 1++ just wondering why

Dan Johnson
Dan Johnson
40,532 Points
Dan Johnson
Dan Johnson
40,532 Points

In your for loop, you'll want to be checking if i is less than the length of the temperatures array. Checking if it's greater causes the loop to never execute, as i starts out at 0, and the length of the temperatures array is 8.

The ++ operator increments a value by 1. It can be either prefix:

// Returns the incremented value of i
++i

Or postfix:

// Returns the value of i, then increments i by 1.
i++

For the purpose of this loop it's equivalent to i += 1 either way.