Drop Char

In this medium-level challenge, you'll implement the DropChar<S, C> type, that drops a specified char from a string.

type Butterfly = DropChar<' b u t t e r f l y ! ', ' '> // 'butterfly!'

Detailed Explanation

type DropChar<S, C extends string> = S extends `${infer Left}${C}${infer Right}`
  ? DropChar<`${Left}${Right}`, C>
  : S

How it works:

• First we constrain the type C to be a string.
• Then we use a template literal and infer to capture the the left and right parts of the string, surrounding the character to drop.
• If the character to drop is found, we recursively pass the left and right parts of the string into DropChar<${Left}${Right}, C>.
• If the character to drop is not found, we return the original string.

This challenge helps you understand TypeScript's advanced type system and how to apply this concept in real-world scenarios.