This shouldn’t matter much in terms of performance, but it’s something to be aware of in performance critical code. In a nutshell, the Kotlin compiler creates an Iterable object and IntRange object, and then the iteration will take place. ![]() While the Kotlin forEach on a range looks pretty similar to the other options, under the hood things work a bit different, which can be seen in the linked video at the 25-minute mark. As such, the syntax of for loop in Kotlin is: for (element in collection) Kotlin loop using a forEach Any class which provides an iterator can be looped over. In Kotlin the for loop is used to iterate through a diversity of types to loop over, such as collections, ranges and maps. Inspired by the Kotlin Under the Hood: Understand the Internals (Google I/O’19) video (which is a really good video btw, I’d recommend watching it if you haven’t), I wanted to list a few ways of looping it Kotlin. Kotlin provides its own way of looping on ranges. ![]() IntStream.range(0, 100).forEach(System.out::println) A Kotlin Approach Examples of either can be seen below: // Traditional for loop ![]() A more modern approach would be something like using a Java 8 IntStream. One of the most well-known ways to iterate on a range is to use the traditional for loop. There’s a common way in Java to do loops.
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