5 important method about javascript Number

Javascript has only one type of number like decimal and without decimal.

1. isFinite()

It identifies if a given number is finite or not. It doesn’t change the type of number just check the finiteness of the number and return true or false.

const number1 = 1.2;
console.log(Number.isFinite(number1)); // true
const number2 = ‘infinity’;
console.log(Number.isFinite(number2)); // false

2. isInteger()

it checks if a given number is an integer or not. If the number is an integer it passes true and if it is infinity, decimal, it will pass false.

const number1 = 3;
console.log(Number.isInteger(number1)); // true
const number2 = 1.2;
console.log(Number.isInteger(number2)); // false

3. isNaN()

NaN means Not a Number. isNaN method determines if a given value is not a number or not. If a value is not a number then it will pass true otherwise it will pass false.

const number1 = 0/0;
console.log(Number.isNaN(number1)); // true
const number2 = 1;
console.log(Number.isNaN(number2)); // false

4. toFixed()

If you want to convert a number to a string with a rounding operation, then you can use this method.

const number1 = 4.567;
console.log(number1.toFixed(2)); // 4.57

5. toString()

This method converts a number to a string.

const number1 = 4.567;
console.log(number1.toString()); // 4.57
console.log(typeof number1.toString()); // string