What is Any Type and Build-in Type in TypeScript?

4 years ago
Afaq Arif
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In this chapter, we will learn about TypeScript Types.

The Type System shows various types of values supported by the language. It tests the validity of the supplied values before they are controlled by the program. This guarantees us that the code will act as expected. We can also do richer code hinting and automated documentation through The Type System.

TypeScript gives data types as a component of its optional Type System. The data type classification is as given below.

The Any type

The any data type is the supertype of all TypeScript types representing a dynamic type. If you use any type, then it will be identical to choosing out of type checking for a variable.

Built-in types

The following table represents all the built-in types in TypeScript.

Data type	Keyword	Description
Number	number	Double precision 64-bit floating point values. It can be used to represent both, integers and fractions.
String	string	Represents a sequence of Unicode characters
Boolean	boolean	Represents logical values, true and false
Void	void	Used on function return types to represent non-returning functions
Null	null	Represents an intentional absence of an object value.
Undefined	undefined	Denotes value given to all uninitialized variables

Note − There is no integer type in TypeScript and JavaScript.

Null and undefined ─ Are they the same?

The null and the undefined datatypes are sometimes confused us. We can not use both to reference the data type of a variable. They can only be given as values to a variable.

However, null and undefined are not the same. A variable instated with undefined means that it has no value or object assigned to it while null means that the variable has been set to an object whose value is undefined.

User-defined Types

User-defined types include Enumerations (enums), classes, interfaces, arrays, and tuple. We will discuss them in detail in the later chapters.