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

Posted by Nistreanu Daniel
Nistreanu Daniel
856 Points

Javascript bug

  • This code should work, it will log all even numbers from 2 to 24, but it doesn't.
script.js 
 var mod;
for(var count = 1; count<25; count++){
mod = count % 2;
  if(mod == 0){
    console.log(mod);

}
};
index.html 
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript Loops</title>
</head>
<body>
<script src="script.js"></script>
</body>
</html>
Nistreanu Daniel
Nistreanu Daniel
856 Points

You're right, sorry for this simple mistake. :)

1 Answer

Steven One
Steven One
28,591 Points

Change console.log(mod) to console.log(count). mod will always == 0 here base on your if condition. Ultimately your script is console logging 0 repeatedly (12 times to be exact in this case).

Also you'll want to declare var mod; outside of the loop so it's not re-declaring the var each time the loop runs.