30-seconds-of-code/snippets/reverseNumber.md

title, tags

title	tags
reverseNumber	number,array,beginner

Reverses a number. Use Object.prototype.toString() to convert number to a string. Use the split function String.prototype.split() to convert string to array and Array.prototype.reverse() to reverse the order of the characters in the string. Combine characters to get a string using String.prototype.join(''). Use the parseFloat() to convert string to a number and use Math.sign() to preserve the signum value of the number. Note: Here parseFloat() is used instead of parseInt() so floating point numbers are properly handled.

const reverseNumber = n => {
  const reveresedNumber = n.toString().split('').reverse().join('');
  return parseFloat(reveresedNumber) * Math.sign(n);
}

reverseNumber(981); // 189
reverseNumber(-500); // -5
reverseNumber(73.6); // 6.37
reverseNumber(-5.23); // -32.5