JSFiddle - React, Tailwind, and code Playground

JavaScript

var num1 = 10.1;
var num2 = 10;

var tofixed = Number.prototype.toFixed;

Number.prototype.toFixed = function(precision)
{
    var num = this.valueOf();
    
    if (num % 1 === 0)
    {
        num = Number(num + ".0");
    }
    
    return tofixed.call(num, precision);
}

console.log(num1.toFixed(2));
console.log(num2.toFixed(2));