// source https://jsbin.com/gavovuh

index.html

<script id="jsbin-javascript">
// Challenge 3: Reverse an Int
// Return an integer in reverse
// ex. reverseInt(521) = 125
function reverseInt(int) 
{
  //Turns the number into a string than it reverses it
  const revString = int.toString().split('').reverse().join('');
  
  //Use parse to turn string into an int, works for negative numbers
  return parseInt(revString) * Math.sign(int);
}


const output = reverseInt(-12345);

console.log(output);
</script>


<script id="jsbin-source-javascript" type="text/javascript">// Challenge 3: Reverse an Int
// Return an integer in reverse
// ex. reverseInt(521) = 125
function reverseInt(int) 
{
  //Turns the number into a string than it reverses it
  const revString = int.toString().split('').reverse().join('');
  
  //Use parse to turn string into an int, works for negative numbers
  return parseInt(revString) * Math.sign(int);
}


const output = reverseInt(-12345);

console.log(output);
</script>

jsbin.gavovuh.js

// Challenge 3: Reverse an Int
// Return an integer in reverse
// ex. reverseInt(521) = 125
function reverseInt(int) 
{
  //Turns the number into a string than it reverses it
  const revString = int.toString().split('').reverse().join('');
  
  //Use parse to turn string into an int, works for negative numbers
  return parseInt(revString) * Math.sign(int);
}


const output = reverseInt(-12345);

console.log(output);