toString()
let num = 10;
num.toString();
num.toString(2);
let num2 = 255;
num2.toString(16);
Math
let num = 5.1;
Math.ceil(num);
Math.floor(num);
Math.round(num);
let userRate = 30.1234;
userRate.toFixed(2);
userRate.toFixed(6);
let x = Number('x');
x == NaN
x === NaN
NaN === NaN
isNaN(x)
isNaN(3)
let margin = '10px';
parseInt(margin);
Number(margin);
let redColor = 'f3';
parseInt(redColor);
parseInt(redColor, 16);
parseInt('11', 2);
let padding = '18.5%';
parseInt(padding);
parseFloat(padding);
Math.random();
Math.floor(Math.random() * 100) + 1
Math.max(1, 2, 3, 4);
Math.min(1, 2, 3, 4);
Math.abs(-1);
Math.pow(2, 10);
Math.sqrt(16);