Similar to JavaScript, TypeScript stores all numerical values as floating-point representations. These numeric values are categorized under the number data type. The number type serves to represent both integers and floating-point numbers. This type transforms the numeric literal into an instance of the number class. The number class functions as a wrapper, allowing manipulation of numeric literals as if they were objects. Additionally, TypeScript accommodates Binary (Base 2), Octal (Base 8), Decimal (Base 10), and Hexadecimal (Base 16) literals.
Syntax
Example
let identifier: number = value;
Example
Example
let first: number = 12.0; // number
let second: number = 0x37CF; // hexadecimal
let third: number = 0o377 ; // octal
let fourth: number = 0b111001; // binary
console.log(first); // 123
console.log(second); // 14287
console.log(third); // 255
console.log(fourth); // 57
Number Properties
The Number objects have the following set of properties:
| SN | Property_Name | Description |
|---|---|---|
1. |
MAX_VALUE | It returns the largest possible value of a number in JavaScript and can have 1.7976931348623157E+308. |
2. |
MIN_VALUE | It returns the smallest possible value of a number in JavaScript and can have 5E-324. |
3. |
NEGATIVE_INFINITY | It returns a value that is less than MIN_VALUE. |
4. |
POSITIVE_INFINITY | It returns a value that is greater than MAX_VALUE. |
5. |
NaN | When some number calculation is not representable by a valid number, then TypeScript returns a value NaN. It is equal to a value that is not a number. |
6. |
prototype | It is a static property of the Number object. It is used to assign new properties and methods to the Number object in the current document. |
Example
Example
console.log("Number Properties: ");
console.log("A number variable can hold maximum value: " + Number.MAX_VALUE);
console.log("A number variable can hold minimum value: " + Number.MIN_VALUE);
console.log("Value of Negative Infinity: " + Number.NEGATIVE_INFINITY);
console.log("Value of Positive Infinity:" + Number.POSITIVE_INFINITY);
console.log("Example of NaN: " +Math.sqrt(-5)); // NaN
Output:
Output
Number Properties:
A number variable can hold maximum value: 1.7976931348623157e+308
A number variable can hold minimum value: 5e-324
Value of Negative Infinity: -Infinity
Value of Positive Infinity: Infinity
Example of NaN: NaN
Number Methods
The list of Number methods with their description is given below.
| SN | Method_Name | Description |
|---|---|---|
1. |
toExponential() | It is used to return the exponential notation in string format. |
2. |
toFixed() | It is used to return the fixed-point notation in string format. |
3. |
toLocaleString() | It is used to convert the number into a local specific representation of the number. |
4. |
toPrecision() | It is used to return the string representation in exponential or fixed-point to the specified precision. |
5. |
toString() | It is used to return the string representation of the number in the specified base. |
6. |
valueOf() | It is used to return the primitive value of the number. |
Example
Example
let myNumber: number = 12345;
let myNumber_1: number = 12.8789;
let myNumber_2: number = 12667.976;
let myNumber_3: number = 12.5779;
let myNumber_4: number = 1234;
let myNumber_5 = new Number(123);
console.log("Number Method: toExponential()");
console.log(myNumber.toExponential());
console.log(myNumber.toExponential(2));
console.log("Number Method: toString()");
console.log(myNumber.toString());
console.log(myNumber.toString(4));
console.log("Number Method: toFixed()");
console.log(myNumber_1.toFixed());
console.log(myNumber_1.toFixed(3));
console.log("Number Method: toLocaleString()");
console.log(myNumber_2.toLocaleString()); // returns in US English
console.log("Number Method: toPrecision()");
console.log(myNumber_3.toPrecision(1));
console.log(myNumber_3.toPrecision(3));
console.log("Number Method: tovalueOf()");
console.log(myNumber_5)
console.log(myNumber_5.valueOf())
console.log(typeof myNumber)
Output:
Output
Number Method: toExponential()
1.2345e+4
1.23e+4
Number Method: toString()
12345
3000321
Number Method: toFixed()
13
12.879
Number Method: toLocaleString()
12,667.976
Number Method: toPrecision()
1e+1
12.6
Number Method: tovalueOf()
[Number: 123]
123
number
