The number of decimal places

index.js

function decLength(number) {
  if (number % 1 !== 0) {
    var str = Number(number).toString();
    var pos = str.indexOf('.');
    return str.slice(pos+1).length;
  }
  return 0;
}
  
//decLength(4.98)
//2

//decLength(5)
//0