basic-types.md

Basic Types

Category: TypeScript

TypeScript basic types are are used in interfaces and type definitions.

Data Type	Example Value/Description
array	let list: Array<string> = ["cat", "dog", "parrot"];
boolean	let isCompleted: boolean = false;
enum	enum Color {Red, Green, Blue} let c: Color = Color.Green;
number	let size: number = 6; let hex: number = 0xb33f;
object	object is a type that represents a non-primitive type, i.e. anything that is not number, string, boolean, etc.
string	let color: string = "blue";
tuple	let details: [string, number, number]; details = ["morning", 10, 42];
void	void is considered the opposite of any and can be used as the return type of functions that do not return a value function doNothing(): void { console.log("This is a log statement"); }
any	let thing: any = 4; thing = "hello world"; thing = 42;

Note: Using the any type is a way to opt-out of type checking and let the values pass through compile-time checks.

Use of any should be avoided where possible however it may be required if describing variables types that are unknown at the time of developing an application.

See Basic Types for more details.