In this case, we simply need to perform checks manually after instantiation, which is not super problematic. If we try to access the Unsafe instance, we encounter a private constructor, and a static getUnsafe() method that raises a SecurityException practically every time we call it: public final class Unsafe ", Foo::class.java)
This class is like one of those scary computer game creatures that are there only to intimidate us, in theory, we can’t get close because they are part of the environment, but it’s often possible by exploiting glitches or holes. The class is an internal JVM tool for executing low-level operations like off-heap memory allocation, thread parking, CAS, and much more. So, Kotlin uses streams for laziness, because they are good when it comes to the main use cases of lazy collections: iteration, filtering, mapping, and random access is unlikely to be encountered very often.Īs you, again, correctly observe, drop lets you access elements by index, which makes the performance implications more explicit in the code.In this short article, we’ll have a look at how we can bypass Kotlin’s native null-safety with, and see why it can be dangerous even if we aren’t messing up with it directly. In Kotlin/Java, list is a data structure with random access to its elements, and the main operation is get(int), which can be implemented lazily, of course, but its performance will often be surprising for the user. In Haskell, a list is primarily a linked list, a pair of head and tail, and the main operation is taking a head of such a list, which is straightforward to efficiently implement lazily.
Unlike Haskell, there's no such thing as a lazy list in Kotlin's standard library, and for a good reason: the primary meaning of "list" in Haskell world and Java world is different. As you correctly observed, sequenceOf ( streamOf() in older versions) is the way to get a lazy stream of numbers.
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