List the built-in types in Typescript?

These are also called the primitive types in Typescript. These are of 5 types: –

1. Number type: it is used to represent number type values and represents double precision floating point values.

   Syntax- var variable_name: number;

2. String type: it represents a sequence of characters stored as Unicode UTF-16 code. It is the same as JavaScript primitive type.

   Syntax- var variable_name: string;

3. Boolean type: in Typescript, it is used to represent a logical value. When we use the Boolean type, we get output only in true or false. It is also the same as JavaScript primitive type.

   Syntax- var variable_name: bool;

4. Null type: it represents a null literal and it is not possible to directly reference the null type value itself.

   Syntax- var variable_name:number=null;

5. Undefined type: it is the type of undefined literal. This type of built-in type is the sub-type of all the types.

   Syntax- var variable_name:number=undefined;