I prefer to add my own extension to be sure of the result and create a much more clear code (just like we have for arrays): fun List. Also, when we try to add an element to a list in Kotlin, it’s not always as straightforward as calling the add () method in Java. If we come from the Java world, these lists may confuse us. There are dedicated arrayOf methods for the following types: double, float, long, int, char, short, byte, boolean. Compared to Java, apart from ArrayList, Kotlin has a few new types of lists, such as List and MutableList. To avoid this overhead Kotlin has wide support for primitive arrays. For instance, adding the following line at the beginning of the extension: if (this is List) return this is a legitimate performance improvement (if it indeed improves the performance).Īlso, because of its name, the resulting code isn't very clear. However, Kotlin will autobox the primitive values to their corresponding object wrapper classes which will have detrimental performance implications.
Nothing guarantees you that it's going to be a new list. In some cases, the lists are not of the same length.
Unfortunately, as its signature and documentation suggest, it's meant to ensure that an Iterable is a List (just like toString and many other to methods). The new list contains PairYou can use the provided extension Iterable.toMutableList() which will provide you with a new list.
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