Round to at most 2 decimal places (only if necessary)

round-number.js

// Solution 1 is to use a script with required rounding algorithm, for example:
// https://stackoverflow.com/questions/11832914/round-to-at-most-2-decimal-places-only-if-necessary
    function roundNumber(num, scale) {
      if (!(`${num}`).includes('e')) {
        return +(`${Math.round(`${num}e+${scale}`)}e-${scale}`);
      }
      const arr = (`${num}`).split('e');
      let sig = '';
      if (+arr[1] + scale > 0) {
        sig = '+';
      }
      return +(`${Math.round(`${+arr[0]}e${sig}${+arr[1] + scale}`)}e-${scale}`);
    }