TypeScript Tricks

Functions

TS Function Generics

Generics in Functions

TypeScript function generics create reusable typed functions like map.

Introduction to Function Generics

TypeScript generics provide a powerful way to create reusable, type-safe functions. By using generics, you can ensure that your functions work with a variety of data types while still maintaining type safety. This is especially useful for functions like map, filter, or reduce, where you want to apply the same logic to different data types.

Basic Generic Function Syntax

To define a function with generics in TypeScript, you use the angle bracket syntax <T> before the function's parameter list. This syntax introduces a generic type variable, T, that can be used to type the function's parameters, return type, or both.

Working with Multiple Type Variables

Sometimes, you need a function that operates on multiple types. You can introduce more than one type variable to achieve this. This approach is useful when you need to work with pairs or other data structures where multiple types are involved.

Constraints in Generics

While generics are flexible, you may want to enforce certain constraints on the types your function can accept. You can use the extends keyword to specify that a type must conform to a particular shape or implement specific properties.

Generic Functions in Real-world Applications

Generic functions are invaluable in building libraries and APIs where flexibility and type safety are crucial. Consider a utility function that processes arrays; by using generics, you can ensure that the function handles arrays of any type consistently.

Conclusion

TypeScript function generics provide a robust way to create flexible and reusable code. By leveraging generics, you can write functions that maintain type safety across different data types, making your code more maintainable and scalable.

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