Type Lookup

Sometimes, you may want to look up a type in a union by its attributes. 🔀

In this medium-level challenge, you'll sometimes, you may want to look up a type in a union by its attributes.. Learn union type manipulation in this medium-level challenge on TypeScriptPro.

You'll learn about union type manipulation, essential skills for advanced TypeScript development and type-level programming.

For this challenge, you will need to change the following code to make the tests pass (no type check errors).

interface Cat {
type: 'cat'
breeds: 'Abyssinian' | 'Shorthair' | 'Curl' | 'Bengal'
}
 
interface Dog {
type: 'dog'
breeds: 'Hound' | 'Brittany' | 'Bulldog' | 'Boxer'
color: 'brown' | 'white' | 'black'
}
 
type MyDogType = LookUp<Cat | Dog, 'dog'> // expected to be `Dog`

Detailed Explanation

This challenge requires understanding of union type manipulation.

The solution involves carefully constructing types that satisfy all test cases while handling edge cases properly.

This challenge helps you understand union type manipulation and how to apply this concept in real-world scenarios.