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$ curl repovive.com/roadmaps/javascript/introduction-to-typescript/literal-types

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$ curl repovive.com/roadmaps/javascript/introduction-to-typescript/literal-types

Repovive

Literal Types - Introduction to TypeScript | JavaScript | Repovive

Repovive.

JavaScript22 sections · 783 units18h total

Open in Course

Literal Types

Specific allowed values

Literal types restrict values to specific strings or numbers:

type Direction = "north" | "south" | "east" | "west";
type DiceRoll = 1 | 2 | 3 | 4 | 5 | 6;

let dir: Direction = "north"; // OK
dir = "up"; // Error: not one of the allowed values

This catches typos and invalid values at compile time.