January 2017
Intermediate to advanced
420 pages
9h 25m
English
Content preview from Programming KotlinBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Functions in the JVM
Prior to version 8 of the Java Virtual Machine (JVM), first class functions were not supported. Since Kotlin targets Java 6 for compatibility with Android devices, how are functions handled by the compiler?
It turns out that all functions in Kotlin are compiled into instances of classes called Function0, Function1, Function2, and so on. The number in the class name represents the number of inputs. If you look at the type inside an IDE, you will be able to see which class the function is being compiled into. For example, a function with the signature (Int)->Boolean would show the type as Function1<Int, Boolean>. Each of the function classes also has an invoke member function that is used to apply the body of the function.
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