Basic Data Types in TypeScript

The basic types in TypeScript are the fundamental elements that allow defining and restricting the values that a variable can take.

Basic data types

Numbers

The “number” data type in TypeScript allows us to represent numbers, whether integers or decimals. We can declare a variable of type “number” as follows:

let edad: number = 25;

Strings

The “string” data type in TypeScript allows us to represent text. We can declare a variable of type “string” as follows:

let nombre: string = "Juan";

Booleans

The boolean data type in TypeScript allows us to represent true or false values. We can declare a variable of type boolean as follows:

let esMayorDeEdad: boolean = true;

Array

The array data type in TypeScript allows us to store multiple values of the same type in a single variable. We can declare a variable of type array as follows:

let numeros: number[] = [1, 2, 3, 4, 5];

Special data types

Any

The any data type in TypeScript allows us to store any type of value. It is useful when we do not know the type of data that a variable will have.

let variable: any = "Hola";
variable = 10;

Void

The void data type in TypeScript is used to represent the absence of a type. It is mainly used in functions that do not return any value.

function saludar(): void {
  console.log("Hola");
}

Null and Undefined

The null and undefined data types in TypeScript represent the absence of a value. We can declare a variable of type null or undefined as follows:

let nulo: null = null;
let indefinido: undefined = undefined;

Never

The never data type in TypeScript is used to represent values that never occur. It is mainly used in functions that throw exceptions or enter infinite loops.

function lanzarError(): never {
  throw new Error("Ocurrió un error");
}