![]() ![]() If you find any problems with my methodology and/or results, please let me know and I will update the article. When you set a listener, Cloud Firestore sends your listener an initial snapshot of the data, and then another snapshot. Hopefully, this rumination on for-loops was illuminating - it’s as exciting as I could make it. Practical differences in efficiency are minimal but may be enough to sway you one way or another if you were looking for any difference at all.Both are identical when used on arrays, lists and other iterables.Functional forEach allocates one or two more objects on numeric ranges (depending on the conditions) but somewhat more consistent, especially when used around other functional operations (e.g.Traditional for-loops are slightly more memory efficient on numeric ranges and probably more readable for Java developers, albeit less “functional”.The same would apply to all other implementations of Iterable, including built-in types and anything custom you may conjure. ![]() The number of Kotlin instructions must be bounded by Olog(N) since excessive. Traditional for-loop: for (i in 0.10) forEach method iterates in ascending order without modifying the array.Let’s say you want to loop over a range of integers, you have two options: ![]()
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