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Acid Coder
Acid Coder

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Typescript Numeric Literal Types How To X + Y (Summation)

#webdev #typescript #tutorial #programming

Have you ever wondered how to add 2 numeric literal types?

now you know

type CreateArrayWithLengthX< LENGTH extends number, ACC extends unknown[] = [], > = ACC['length'] extends LENGTH ? ACC : CreateArrayWithLengthX<LENGTH, [...ACC,1]> type AddTwoNumber<T extends number, U extends number> = [...CreateArrayWithLengthX<T>,...CreateArrayWithLengthX<U>]['length'] type A = AddTwoNumber<999,999> //1998
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limitation: the number cannot exceed 999 because the max depth of TS recursion is only 1000, only work with positive integer

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