![]() ![]() ![]() So if we check our newly created NonMutableList with the code at the beginning of this post, we can see that is not implementing MutableList. In other words, if you write a Kotlin class implementing List, it will not implement MutableList. Call the joinToString () function on the list of characters, the function returns, a string created from joining the characters in the given list. To convert a list of characters to a string in Kotlin, you can use List.joinToString () function with an empty string as separator between the elements. I couldn’t find much information about these markers and how they work in the compiler, but the final result seems that all Java implementation of List are recognized as MutableList together with only the Kotlin classes that explicitly implement MutableList interface. Kotlin Convert list of characters to a string. We saw that KMappedMarker is automatically added to any new List implementation written in Kotlin. Their use is defined in the file mutabilityMarkerInterfaces.kt. To define a list of Lists in Kotlin, call listOf () function and provide other Lists as elements to this function. You can see that it is checking two special interfaces which are used by the compiler and work like markers: KMutableList and KMappedMarker. Kotlin List is one of the three Collections (List, Set, Map). The reason is that MutableList inherits from List: public interface MutableList : List, MutableCollection List is a collection of elements whose position in the collection is preserved, whereas in Set. I wanted to show why it is not right to assume that List in Kotlin is immutable. Kotlin List is one of the three Collections (List, Set, Map). It started with a (mostly) harmless piece of code. “Only heavens are immutable” - Aristotle Part I - the surprise
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