In Kotlin, an alias is a way to give a new name to an existing type. It makes code more readable and expressive by giving meaningful names to the types or functions.
Here is an example of how to use alias in Kotlin:
typealias Age = Int
val myAge: Age = 25
In this example, we create an alias Age for the Int type. We then declare a variable myAge of type Age and assign it a value of 25. This can also be used with function types:
typealias Operation = (Int, Int) -> Int
val sum: Operation = { a, b -> a + b }
In this example, we create an alias Operation for the function type (Int, Int) -> Int. We then declare a variable sum of type Operation and assign it a lambda that sums two integers.
Using aliases can help make your code easier to read and more expressive. They can also make refactoring easier by allowing you to change the underlying type without changing all the parts of the code that use the type.