![]() ![]() You may need to decipher that every time you come back to it. We’ll see how we can do this with for loops, iterators, and some handy extension functions. The indices/ mapIndexed-solution rather hide what's going on. In this short tutorial, we’ll look at how to iterate over a map in Kotlin. However I dont seem to have this ability within Kotlin, I know how to get the index in a for loop but no idea on how to tell it to skip by 2 so I dont accidentally get something I already parsed on the last loop lap. Kotlin is used to develop Android apps, server side apps, and much more. Kotlin is easy to learn, especially if you already know Java (it is 100 compatible with Java). It's way easier to read when you come back. as you see, each run in the loop I get two results from the regex search and as a result I tell the for loop to increment by two to avoid collision. Kotlin is a modern, trending programming language. And I can only recommend you to use the flatMap instead. Depending on how complex your condition is, the indices themselvses will not suffice you. Note that if what you are trying to insert is static, solution with the indices is of course easier then the mapping I've presented above. It should be easy enough though to add that case. indexOf returns -1 or itemsToInsertAfterMatch = null). Lists support all common operations for element retrieval: elementAt(), first(), last(), and others listed in Retrieve single elements. Index access to the elements of lists provides a powerful set of operations for lists. what is matched with what? and what is inserted when where?).Īll the above solutions did not yet deal with the case when an element wasn't found (e.g. List is the most popular type of built-in collection in Kotlin. ![]() If you do not must (and who forces you?), I wouldn't use such a construct. You do it in one place, but forget to do in another and now you. Pitfall number two: For some reason, you want to change the behavior of your dynamic step. You should obviously never do it, but changing the increment is the first step in this direction. For some simple actions you can use the safe call operator, assuming the action also respects not operating on an empty list (to handle your case of both null and empty: myList?.As you said you iterate over the list, maybe a flatMap is rather something for you (in this example I add "odd", "even" after elements that are odd/even): val list = listOf("1", "2", "3", "4")Ġ -> listOf(it, " listOf(it, " itemsToInsertAfterMatch?.let Pitfall number one: You accidentally or intentionally changing i somewhere inside your loop. ![]()
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