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JavaScript JavaScript Loops, Arrays and Objects Simplify Repetitive Tasks with Loops Refactor Using a Loop

Jesse Fister
Jesse Fister
11,968 Points
Posted by Jesse Fister
Jesse Fister
11,968 Points

Logging even numbers

I'm trying to simplify this code. It wants the even numbers from 2-24 in console.log. Here is my code:

for (i =2; i<= 24; i++) { console.log(i); }

script.js 
console.log(2);
console.log(4);
console.log(6);
console.log(8);
console.log(10);
console.log(12);
console.log(14);
console.log(16);
console.log(18);
console.log(20);
console.log(22);
console.log(24);
for (i =2; i<= 24; i++) {
  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>

3 Answers

Joel Smith
Joel Smith
14,779 Points

try: 

for (var i =2; i<= 24; i+=2) { 
  console.log(i);
}

the difference being adding 2 digits for every loop with i+=2

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

Good answer Joel Smith .

Jesse Fister although my examples show using the for loop and incrementing by just 1 each time through the loop, you don't have to do that. The last part of the for loop can be any expression you want. For example:

for (var i=2; i<=256; i = i * i) {
    console.log(i);
}

This will log the squares of i -- 2, 4, 16, 256 -- to the console.

Joel Smith
Joel Smith
14,779 Points

Thanks Dave. Can I get an upvote for that? Trying to get My points! :)..

Also, thanks for wrapping My code so that it showed properly. I'd been trying to figure out how to do that for a while now. :)

Jesse Fister
Jesse Fister
11,968 Points
Jesse Fister
Jesse Fister
11,968 Points

Thanks Dave McFarland and Joel Smith. That makes sense!

Richard Mellor
Richard Mellor
13,770 Points
Richard Mellor
Richard Mellor
13,770 Points

Great challenge! I over complicated myself with modulus, but I definately had the right idea!

Enjoying the course so far Dave, thanks!