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User-defined type guards are a way of ensuring that a value has a specific type in TypeScript. This can be useful when you need to check the type of a value in your code, for example, if you want to check that a value is a number or a string. With user-defined type guards, you can write code that checks the type of a value in a way that is both concise and readable.
One of the benefits of user-defined type guards is that they make your code easier to understand. When you use type guards, you can be sure that the values you are working with have the types that you expect them to have. This makes your code less prone to errors, and also makes it easier for other coders to understand what your code is doing.
Another advantage of user-defined type guards is that they allow you to write code that is more efficient. With type guards, you can check the type of a value once, and then use that information throughout your code. This can save you time and make your code run faster, as you don’t have to check the type of a value multiple times.
In addition, user-defined type guards can be used to create custom types in TypeScript. This can be useful when you need to define a type that is not part of the standard TypeScript library, or when you want to define a type that has specific constraints or restrictions. With user-defined type guards, you can create custom types that meet the needs of your specific application.
Overall, user-defined type guards are a valuable tool for coders who use TypeScript. They help you write more concise and readable code, make your code easier to understand, and allow you to create custom types that meet the needs of your application. If you are new to TypeScript, it is highly recommended that you learn how to use user-defined type guards and start using them in your projects.
TypeScript for Coders – Chapter 12 : User-defined Type Guards
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