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Data types in TypeScript

Last Updated : 15 May, 2024
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When you create a variable, you’re planning to give it a value. But what kind of value it can hold depends on the variable’s data type. In TypeScript, the type system defines the various data types supported by the language. The data type classification is as given below:

Built-in Datatypes:

TypeScript has some pre-defined data-types-

Built-in Data Type keyword Description
Number number It is used to represent both Integer as well as Floating-Point numbers
Boolean boolean Represents true and false
String string It is used to represent a sequence of characters
Void void Generally used on function return-types
Null null It is used when an object does not have any value
Undefined undefined Denotes value given to uninitialized variable
Any any If variable is declared with any data-type then any type of value can be assigned to that variable


let a: null = null; let b: number = 123; let c: number = 123.456; let d: string = ‘Geeks’; let e: undefined = undefined; let f: boolean = true; let g: number = 0b111001; // Binary let h: number = 0o436; // Octal let i: number = 0xadf0d; // Hexa-Decimal

User-defined Data Types:

Apart from built-in data types, user can also define its own data type. User-defined types include Enumerations (enums), classes, interfaces, arrays, and tuple.


In built-in data types,


is a special data-type, also the super data-type of all data types. If a variable is declared with any data type then we can assign any type value to that variable.


let a: any = null; let b: any =123; let c: any = 123.456; let d: any = ‘Geeks’; let e: any = undefined; let f: any = true;

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