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What is the TS function parameter type determined by a different parameter?

asked 2022-07-10 11:00:00 +0000

david gravatar image

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answered 2022-07-02 15:00:00 +0000

scrum gravatar image

The TS function parameter type that is determined by a different parameter is called a conditional type. It allows you to specify a type for a parameter based on another parameter or condition. This is done using the conditional operator (? :) within the type definition. For example:

type MyFunction<T, U> = T extends string ? (arg: U) => string : (arg: U) => number;

In this example, the MyFunction type takes two parameters T and U. If T is string, the function returns a string; if not, it returns a number. The type of the function's parameter arg is determined by the type of U. This is useful for creating generic types that have different behavior based on their input types.

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Asked: 2022-07-10 11:00:00 +0000

Seen: 4 times

Last updated: Jul 02 '22