# Binary to Decimal

Hard

0.0% Acceptance

Implement `BinaryToDecimal<S>`

which takes an exact string type `S`

consisting 0 and 1 and returns an exact number type corresponding with `S`

when `S`

is regarded as a binary.

You can assume that the length of `S`

is equal to or less than 8 and `S`

is not empty.

`type Res1 = BinaryToDecimal<'10'>; // expected to be 2 type Res2 = BinaryToDecimal<'0011'>; // expected to be 3`