ts-advent-2024-12.ts

ts-advent-2024-12.ts

type StrToNum<S extends string> = 
    S extends `${infer I extends number}` ? I : never;

type NaughtyOrNice<S extends string, Result = 'naughty'> = 
    S extends "" ? Result :
    S extends `${infer _}${infer R}` 
        ? NaughtyOrNice<R, Result extends 'naughty' ? 'nice' : 'naughty'>
        : never;

type FormatNames<A extends string[][]> = 
    { [K in keyof A]: 
        { name: A[K][0], 
          count: StrToNum<A[K][2]>, 
          rating: NaughtyOrNice<A[K][0]>
        } 
    };