declare const day: Day;
let result = 0;

switch (day) {
  case 'Monday':
    result = 1;
    break;
  case 'Tuesday':
    result = 2;
    break;
  case 'Wednesday':
    result = 3;
    break;
  case 'Thursday':
    result = 4;
    break;
  case 'Friday':
    result = 5;
    break;
  case 'Saturday':
    result = 6;
    break;
  case 'Sunday':
    result = 7;
    break;
}
```

### ✅ Correct

```ts
type Day =
  | 'Monday'
  | 'Tuesday'
  | 'Wednesday'
  | 'Thursday'
  | 'Friday'
  | 'Saturday'
  | 'Sunday';

declare const day: Day;
let result = 0;

switch (day) {
  case 'Monday':
    result = 1;
    break;
  default:
    result = 42;
}
```

<!--/tabs-->

Likewise, here are some examples of code working with an enum:

<!--tabs-->

### ❌ Incorrect

```ts
enum Fruit {
  Apple,
  Banana,
  Cherry,
}

declare const fruit: Fruit;

switch (fruit) {
  case Fruit.Apple:
    console.log('an apple');
    break;
}
```

### ✅ Correct

```ts
enum Fruit {
  Apple,
  Banana,
  Cherry,
}

declare const fruit: Fruit;

switch (fruit) {
  case Fruit.Apple:
    console.log('an apple');
    break;

  case Fruit.Banana:
    console.log('a banana');
    break;

  case Fruit.Cherry:
    console.log('a cherry');
    break;
}
```

### ✅ Correct

```ts
enum Fruit {
  Apple,
  Banana,
  Cherry,
}

declare const fruit: Fruit;

switch (fruit) {
  case Fruit.Apple:
    console.log('an apple');
    break;

  default:
    console.log('a fruit');
    break;
}
```

<!--/tabs-->

## When Not To Use It

If you don't frequently `switch` over union types or enums with many parts, or intentionally wish to leave out some parts, this rule may not be for you.