TypeScript Numbers

Like JavaScript, all the numbers in TypeScript are stored as floating-point values. These numeric values are treated like a number data type. The number is used to represents both integers as well as floating-point values. The number type converts the numeric literal to an instance of the number class. The number class acts as a wrapper and manipulate the numeric literals as they were objects. TypeScript also supports Binary(Base 2), Octal(Base 8), Decimal(Base 10), and Hexadecimal(Base 16) literals.


let identifier: number = value;


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.


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


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.


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("Number Method: toString()");

console.log("Number Method: toFixed()");

console.log("Number Method: toLocaleString()");
console.log(myNumber_2.toLocaleString()); // returns in US English

console.log("Number Method: toPrecision()");

console.log("Number Method: tovalueOf()");
console.log(typeof myNumber)


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
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