Reverse number
JavaScript, Math, String · Sep 18, 2020
Reverses a number.
- Use
Object.prototype.toString()to convertnto a string. - Use
String.prototype.split(),Array.prototype.reverse()andArray.prototype.join()to get the reversed value ofnas a string. - Use
parseFloat()to convert the string to a number andMath.sign()to preserve its sign.
const reverseNumber = n =>
parseFloat(`${n}`.split('').reverse().join('')) * Math.sign(n);reverseNumber(981); // 189
reverseNumber(-500); // -5
reverseNumber(73.6); // 6.37
reverseNumber(-5.23); // -32.5
