![]() ![]() as part of the pair to each iteration, there's no need for a temporary variable outside the function to track this.įinally, because the accumulated value is a Pair, we use destructuring to extract only the accumulated list (the first value) of the pair with val (filteredList, _) = pair. Because we pass the Bool tracking if we've seen. newList + item doesn't add the item to the immutable list, it returns a new immutable list with the item appended to it. įor each element of the original list, we return a new pair, adding the item to the new list (if necessary) and updating whether we have already seen. Here we set the accumulator to a Pair of an empty list, where we will build up the new list, and a boolean, to track if we've already seen. ![]() We shall then clear the contents of this list using clear () function. The syntax of MutableList.clear () function is MutableList.clear () Example In the following program, we will create a mutable list with some elements in it. If (item = "." & !found) Pair(newList + item, true)Įlse if (item = ".") Pair(newList, true)įold() takes an initial accumulator value, then applies the function for each element of list, updating the accumulator as it goes. To remove all elements from a Mutable List in Kotlin, call clear () function on this list object. ![]() Val (filteredList, _) = originalList.fold( Here's how to do it with an immutable list in a function that doesn't expose any state externally, by making use of fold(): val originalList = listOf("1", "2", "3", ".", "4", ".") Since you're using Kotlin, you have the advantage of immutable data types and functions without side-effects. The also branch is also hit, so firstInstanceFound will be true for any subsequent delimiters found. When the first delimiter is found, firstInstanceFound will be false, so the logical statement evaluates to false. Please note that the standard naming conventions and coding styles for these 2 languages are also different. It also can be served as your quick reference guide for Kotlin syntax. It gives you a quick overview of syntax comparisons between C and Kotlin. Due to logical short-circuiting, anything that isn't the delimiter will return false before the part after the & is reached. If you are a C developer and new to Kotlin, this article is for you. fun MutableList.removeDuplicates(): Boolean Įxplanation: removeAll will remove anything for which the lambda returns true. ![]() You can use a temporary MutableSet to easily check if values are duplicates. ![]()
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