A Dozen Cool Things We Can Do With Popular JVM Languages
summary
Shows a dozen concrete tricks across Java, Scala, Groovy and Kotlin: file reads using Groovy’s new File(...).text and Kotlin’s readText, running shells with "git".execute().text in Groovy, implementing an AutoCloseable use(Consumer<Resource>) execute‑around helper in Java to guarantee cleanup, Scala traits for stackable mixins, Collector.joining for comma lists, Scala lazy vals to avoid duplicate work, Kotlin smart‑casting/pattern matching, Groovy MarkupBuilder XML DSL, tail‑call optimization in Scala, and Kotlin extension/infix functions.
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chapters (14)
- 0:00Introduction to JVM languages
- 1:29Reading files in Groovy Scala Kotlin
- 5:00Interacting with external processes
- 9:16Execute around method pattern
- 23:00Traits and stackability in Scala
- 25:49Joining values in a string
- 29:41Lazy evaluation in Scala
- 34:21Argument matching in Kotlin
- 37:53Smart casting in Java
- 41:48Creating XML with Groovy
- 46:03Tail call optimization in Scala
- 49:16Extension functions in Kotlin
- 50:39Infix notation for fluent syntax
- 52:06Summary and closing
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