Only val or var is missing - simply because in Kotlin function parameters are always implicitly val, hence “ final”. If we omit vararg for a moment and look at the declaration of the (single) parameter elements, we notice the striking resemblance to a common variable declaration: first the name, then a :, followed by the type. The fact that the name of the function ( listOf) is next, is likewise no deviation from the Java syntax.īut several of these follow within the parentheses: īut one after the other: following fun there is a generic type declaration - exactly how it is done in Java. Their return type follows the function name (and any parameters), separated by a.
The return type is lastĪs we have seen in variable declarations, their type is noted at the very end, after their name.
Its name fun stands, unsurprisingly, for function. Just like variable declarations initiated with their own keywords ( var or val), functions are also declared with a specific keyword. Kotlin is lots of funīut already the second keyword lets even experienced Java users down, because there is no fun in Java (well, at least not as much as in Kotlin -) ). Public is no surprise for Java professionals, so far so good.
Public fun listOf ( vararg elements : T ) : List In order to clear this hurdle as soon as possible, I would like to venture with you “the jump into the deep end” right away and carefully walk you through a Kotlin example.Īfter that, I hope you will have all the tools under your belt not to be deterred by Kotlin (any longer), but rather enjoy a flying start.Īlthough it is relatively simple Kotlin code, even for Java connoisseurs it is not necessarily straightforward, especially because it uses and combines several Kotlin language constructs all at once: Even as an experienced Java developer, it was not easy for me at first to read and understand the many Kotlin examples and existing Kotlin code - especially such code, which made use of several of the many Kotlin features simultaneously.īut struggling to understand even short code examples of a new language - although you have been working with Java, for example, successfully for many years - is a major hurdle trying to familiarize yourself with a new syntax.Īnyone who has ever tried to learn the touch typing system, although it has worked so well with only four fingers for years, knows what I mean …
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