![]() Memoization can be achieved easily with decorators (functools.lru_cache) or it could even work to use a nested (inner) function which handles the memoized list. The Kotlin list is of two types: Mutable list Read-only list To create a mutable list, you can use the mutableListOf function as below. Same way why we try to avoid global variables. So it is foolish to rely on such a behavior, because it can become a nightmare to debug, why your code doesn't do what you expect. So if you use an empty list as default, it will be created once and whatever modification you do on it, will persist for the next time you call the same function again. However, in Python, default parameters are only initialized ONCE in the code. You can add or delete an item to the Mutable List using its built-in Kotlin functions. ![]() abstract fun add(index: Int, element: E) Common JVM JS Native 1. abstract fun add(element: E): Boolean Inserts an element into the list at the specified index. ![]() Functions Common JVM JS Native 1.0 add Adds the specified element to the end of this list. ![]() It is a principle of functional programming, that a function with the same input has to produce the same output. You can provide the type of data that can be added to a mutable list. The mutable list is invariant in its element type. fun FloatArray.The predicates are simple lambda expressions. This is exploiting the fact that java types like ArrayList are implicitly implementing the type MutableList via a compiler trick. Populates and returns the destination mutable map with key-value pairs, where key is provided by the keySelector function applied to each element of the given array and value is the element itself. We use predicates to define the filtering conditions. These functions return a new List and are usable for both read-only and mutable Lists. The essence is that it breaks the referential transparency of your code. The standard Kotlin library provides many beneficial functions to filter a List. First an article where it's explained in detail, why it's a bad idea to use a list (or other mutable container) as default parameter.
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