![]() ![]() For example, you can’t extend toUppercase() on String, but you can extend convertToUppercase(). If you define an extension function with the same signature as an already existing member function, the member function will always be called because the function that’s called depends on the declared static type of the variable, not on the runtime type of the value stored in that variable. You cannot override an existing member function. Let’s say that you have a class called Dog that has a name, breed and age. Read on to find out how to extend your code readability with extensions! Extension functions - usage Extensions can be used with third party libraries, Android SDK, or user defined classes. Unlike the Java programming language’s equivalent, extensions appear in Android Studio’s autocomplete. These let you add functionality to a class without the need to inherit or create a function that takes in the class. Thankfully, Kotlin comes to the rescue with extension functions and properties. Both of these work as solutions but neither promote easy, readable code. The Java programming language usually solves this problem with a Utils class but this does not show up in autocomplete which makes it harder to find and less intuitive to use. You could inherit from the class or create a function that takes in an instance of the class to solve this problem. Have you ever used an API and wanted to add functionality or a property to it? Kotlin Vocabulary: extension functions and properties ![]()
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