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In TypeScript , there is no concept of integer data types like in other programming languages. Usually, only numbertype is used to represent floating point numbers.

bigintis the latest version of TypeScript, which represents large integers.

numberRepresenting numbers in TypeScript using the type

The type in TypeScript numbercan hold both integer and floating point data types.

It can also store numbers in different bases such as binary, octal, and hexadecimal.

// the count of something is in whole numbers
var countDogs : number = 10;
// the price of a bag can be a floating point number
var priceBag : number = 200.99;
var binaryNumber : number = 0b101;
var octalNumber : number = 0o30;
var hexadecimalNumber : number = 0xFF;

console.log(countDogs);
console.log(priceBag);
console.log(binaryNumber);
console.log(octalNumber);
console.log(hexadecimalNumber);

Output:

10
200.99
5
24
255

Numbers in different bases are base 10printed with . Binary or base 2can be represented by prefixing 0bor 0B, similarly for base 16, it must be prefixed with 0xor .0X

In TypeScript, we bigintuse

bigintThe type is used to represent very large numbers (numbers more than 2<sup>53</sup> - 1)and has the character at the end of integer literals n.

var bigNumber: bigint = 82937289372323n;
console.log(bigNumber);

Output:

82937289372323 

parseIntConvert a string to an integer using built-in functions in TypeScript

parseIntFunction is used to convert from string to integer and parseFloatfunction is used to convert from string to floating point data type.

var intString : string = "34";
var floatString : string = "34.56";

console.log(parseInt(intString));
console.log(parseInt(floatString));
console.log(parseFloat(intString));
console.log(parseFloat(floatString));

var notANumber : string = "string";
console.log(parseInt(notANumber));

Output:

34 
34 
34 
34.56 
NaN 

Therefore parseIntthe and parseFloatmethods will return NaN.

+Convert a string to a number using the operator in TypeScript

+Operator can convert a string literal to numbertype. After converting it to numbertype, further operations are performed.

function checkiFInt( val : number | string ) {
    if (( val as any) instanceof String){
        val = +val as number;
    }
    console.log(Math.ceil(val as number) == Math.floor(val as number));
}

checkiFInt('34.5');
checkiFInt('34');
checkiFInt('34.5232');
checkiFInt('34.9');
checkiFInt('0');

Output:

false
true
false
false
true