![]() ![]() According to Google’s Kotlin style guide the only whitespace chars that are allowed in a source file are the line terminator sequence and the ASCII horizontal space character (0x20). A simple problem Let's assume that we want to write a generic function that takes a collection and returns a map containing the elements from the original collection associated to their number of occurrences: Kotlin MutableList (mutableListOf ()) Kotlin MutableList is an interface and generic collection of elements. ![]() mapValues ( transform : ( Entry ) -> R ) : Map Array, Populates and returns the destination mutable map with key-value pairs for each element of the given array, where key is the element itself and value is provided Kotlin Array Array is collection of similar data types either of Int, String etc. If these extended Java’s Map, they’d have to be mutable as well. map The Kotlin standard library reference says that both filter and map return a list. The mutable map is invariant in its Map are of two types, immutable map (cannot be modified) and mutable map (can be modified). ![]()
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