![]() ![]() You may need to decipher that every time you come back to it. The indices/ mapIndexed-solution rather hide what's going on. It's way easier to read when you come back. The index of the for loop is read-only because changing it breaks the expectation of the reader and is much less maintainable. ![]() In the following example, we are iterating through array list of planets and printing each. And I can only recommend you to use the flatMap instead. We can use for loop to iterate through an arraylist in Kotlin. Progressions have three essential properties: the first element, the last element, and a. In Kotlin, these progressions are defined by special types: IntProgression, LongProgression, and CharProgression. Depending on how complex your condition is, the indices themselvses will not suffice you. As shown in the examples above, the ranges of integral types, such as Int, Long, and Char, can be treated as arithmetic progressions of them. During each iteration, you shall get the pair (index, element). If the startIndex is invalid, it will throw one. fun String.substring (startIndex: Int) : String This method will return one substring starting from index startIndex to the end of the string. For the list, you should mention List.withIndex() similar to what we have mentioned nums.withIndex(). In this post, I will show you how to use these Kotlin substring extension functions with examples. You can also access the index of element, along with the element, of the list. It allocates temporary memory for index iterations which makes the overall system to redundant its performance in terms of memory allocation. 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. Example 4 Kotlin For Loop Access index and element. The foreach loop though iterates over an array of elements, the execution is simplified and finishes the loop in less time comparatively. It should be easy enough though to add that case. indexOf returns -1 or itemsToInsertAfterMatch = null). 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. If you do not must (and who forces you?), I wouldn't use such a construct. ![]() 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 ![]()
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