A **tuple** is a typed array with a fixed length and known element types.

```ts
let user: [string, number];

user = ["Alice", 30]; //  OK
// user = [30, "Alice"]; //  Error: wrong order/types

```

**Enums** let you define a set of **named values**. These values can be numeric or string-based.

```ts
// numeric enums
enum OrderStatus {
  PENDING, // 0
  SHIPED,   // 1
  DELIVERED,  // 2
  RETURNED,  // 3
}

const status = OrderStatus.DELIVERED;

function isDelivered (status:OrderStatus ){
     return status === OrderStatus.DELIVERED
}

isDelivered(OrderStatus.RETURNED)

// string enums
enum Direction {
  Left = "LEFT",
  Right = "RIGHT",
  Up = "UP",
  Down = "DOWN"
}

const move = (dir: Direction) => {
  console.log("Moving:", dir);
};

move(Direction.Left);
```


Tuples and Enums in TypeScript

How to use tuples for fixed-length typed arrays and enums for named constants in TypeScript