code: function round(val) {
      var precision = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;
  
      if (!isNumber(val) || isNumericalNaN(val)) {
          throw new TypeError('Value should be numeric');
      }
  
      if (precision === !1 || precision < 1) {
          return Math.round(val);
      }
  
      var exp = Math.pow(10, Math.round(precision));
      return Math.round(val * exp) / exp;
  }
docs: Round a decimal value