TypeScript Enums

Enums group related constant values. ## Why enums? Avoid magic strings/numbers. ## Numeric enum ```ts enum Direction { Up, Down, Left, Right } let move: Direction = Direction.Up; ``` ## String enum ```ts enum Status { Loading = "loading", Success = "success", Error = "error" } ``` ## Using enum ```ts function setStatus(s: Status) { console.log(s); } setStatus(Status.Success); ``` ## Enum vs union literals Union is lighter, enum is structured. Choose based on style and needs. ## Graph ```mermaid flowchart TD A[Status] --> B[Loading] A --> C[Success] A --> D[Error] ``` ## Remember - Enums represent fixed options - Improve readability