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39. implement ToNumber<T>
Solution:
type ToNumber<T extends string> = T extends '0' ? 0 : T extends '1' ? 1 : T extends '2' ? 2 : T extends '3' ? 3 : T extends '4' ? 4 : T extends '5' ? 5 : T extends '6' ? 6 : T extends '7' ? 7 : T extends '8' ? 8 : T extends '9' ? 9 : never;type A = ToNumber<'1'> // 1type B = ToNumber<'40'> // 40type C = ToNumber<'0'> // 0
In the above solution, we use conditional types to check whether the given string is a digit or not. We also use never to provide type safety to our solution.