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yohamta/Add.ts

Created November 18, 2021 03:52
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Shitty add function in typescript
Raw
Add.ts
type Len<T extends any[]> = T["length"]
type _Add<
T,
N1 extends Number,
N2 extends Number,
Curr1 extends any[],
Curr2 extends any[]
> = Len<Curr1> extends N1
? Len<Curr2> extends N2
? Len<[...Curr1, ...Curr2]>
: _Add<T, N1, N2, Curr1, [T, ...Curr2]>
: _Add<T, N1, N2, [T, ...Curr1], Curr2>;
type Add<N1 extends Number, N2 extends Number> = _Add<any, N1, N2, [], []>
type X = Add<3, 5>; // type X = 8
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