Familiarity with using the Kotlin Playground for editing Kotlin programs. Android application development becomes much more efficient and pleasant with Kotlin. < Contribute Learn. 12.3K views. De plus, grâce au mécanisme de fonctions d'extension (que nous verrons ultérieurement lors du prochain chapitre sur les classes), les collections bénéficient de plusieurs méthodes supplémentaires par rapport a leurs équivalents Java. If you are from Java background, you must be aware of this class and how to use it. Explore this playground and try new concepts right into your browser. @HappyDev at least here it will use an wildcard import for that class, and for some (me included) that is not ideal. 04 Control structures. Put your files between