Type aliases in Kotlin
In Kotlin, a typealias is a way to give a new name to an existing type.
Type aliases can greatly improve code readability and maintainability by providing meaningful names for types and functions.
Let’s start with simpler examples and gradually move to more complex ones:
1.Basic Type Alias:
This typealias simply creates a new name UserName for the existing type String. It allows you to use UserName instead of String in your code, making it more readable and self-explanatory.
2.Function Type Alias:
Here, Operation is a typealias for a function that takes two integers as parameters and returns an integer. This can represent various arithmetic operations like addition, subtraction, multiplication, etc.
3.Generic Type Alias:
In this example, ResultHandler<T> is a typealias for a function that takes a Result<T> object and doesn't return anything (Unit). Result<T> represents the result of an operation, and T is the type of the result.
4.Lambda with Receiver Type Alias:
Here, Configuration<T> is a typealias for a lambda with receiver. It defines a lambda that is an extension function on an object of type T and returns nothing (Unit). This is commonly used for configuring objects in a DSL (Domain-Specific Language) style.
5.Higher-Order Function Type Alias:
This typealias Predicate<T> represents a higher-order function that takes an object of type T and returns a Boolean value. It's commonly used to define conditions or filters.
6.Complex Type Alias with Multiple Parameters:
Here, Comparator<T> is a typealias for a function that compares two objects of type T and returns an integer value that indicates their order. This is often used for sorting collections.
