Switching from Essentials4J to Kotlin

At work we have a project that used Essentials4J, and its predecessor Rapidoid Fluent, to simplify some stream/collection APIs. We have been converting this project to Kotlin, and no longer need that library. The conversion was very simple. It highlights some of the things you can do with collections with Kotlin’s standard library. Do.group(…).by(…) Do.map(…).to(…) …

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