In addition to that, functions may appear as 'higher-order functions', which in turn is described as the following on Wikipedia:

Īs already said, functions are as powerful and significant as any other type, e.g. These operations typically include being passed as an argument, returned from a function, modified, and assigned to a variable. Kotlin makes functions “first-class citizens” of the language, which Wikipedia describes as follows:Ī first-class citizen is an entity which supports all the operations generally available to other entities. Functions can exist on the same level as classes, may be assigned to variables and can also be passed to/returned from other functions. In Kotlin, functions are as important as basic types such as integers or strings. Towards the end of the article there will be an example showing how to apply scope functions in order to structure Kotlin code in a more idiomatic way.

With this article, I want to demonstrate the differences between all scope functions and discuss relevant use cases. There’s a big chance you came across those already but maybe you need some guidance on how to choose the right one and how to use them. One special collection of standard functions is called scope functions which are part of the Kotlin library: let, run, also, apply and with. Kotlin’s five powerful scope functions you should know how to useįunctions in Kotlin are super important and they are one of the many vital aspects of the language.

Internal function kotlin