Web Reference: Sep 4, 2024 · In TypeScript, generic constraints restrict the types that can be used with a generic type by using the extends keyword. This ensures that the generic type adheres to a specific structure or interface, allowing access to certain properties or methods within the generic type. Using “extends” in is a promise that the data type will either itself directly implement Comparable, or else will extend a class implementing Comparable. Aug 4, 2019 · By using extends, you can specify that the type has to have certain properties. This will forbid anyone from calling your function with anything that doesn't have those properties, and then will allow you to use those properties at will inside the function.
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