Tuple to Union

Implement a generic TupleToUnion<T> which covers the values of a tuple to its values union. 📦

In this medium-level challenge, you'll implement a generic tupletounion<t> which covers the values of a tuple to its values union.. Learn conditional types with infer, union type manipulation, tuple manipulation in this medium-level challenge on TypeScriptPro.

You'll learn about conditional types with infer, union type manipulation, tuple 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).

type Arr = ['1', '2', '3']
 
type Test = TupleToUnion<Arr> // expected to be '1' | '2' | '3'

Detailed Explanation

To convert a tuple to a union, we use indexed access:

type TupleToUnion<T extends readonly any[]> = T[number]

How it works:

• T[number] accesses all numeric indices of the tuple
• This produces a union of all tuple element types

This challenge helps you understand conditional types with infer and how to apply these concepts in real-world scenarios.