psilospore/scala_cheat.md

## scala_cheat.md

      
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              scala_cheat.md
            
          
    Scala Cheatsheet

Java Interop

Shitty Optional to Option

import java.util.Optional
import scala.compat.java8.OptionConverters._

Optional("Optional<String>").asScala.map(_ + " is now converted to Option[String] and I don't have to use Java's shitty Optional API")

Long.box to convert to Java Longs
_.toLong to convert to Scala longs
Collections

import java.util.HashSet
import scala.collection.JavaConverters._

val l = List(1l, 2l, 3l).asJava


However if you Java's types you need to convert so