gistfile1.txt

› amm
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Welcome to the Ammonite Repl 0.7.6
(Scala 2.11.8 Java 1.8.0_65)
@ import $ivy.`org.scalaz::scalaz-core:7.2.6`
:: loading settings :: url = jar:file:/usr/local/Cellar/ammonite-repl/0.7.6/bin/amm!/org/apache/ivy/core/settings/ivysettings.xml
:: resolving dependencies :: org.scalaz#scalaz-core_2.11-caller;working
	confs: [default]
	found org.scalaz#scalaz-core_2.11;7.2.6 in chain-resolver
	found org.scala-lang#scala-library;2.11.8 in chain-resolver
	[2.11.8] org.scala-lang#scala-library;2.11.8
import $ivy.$
@ import scalaz._
import scalaz._
@ import Scalaz._
import Scalaz._
@ List(1, -1, 2, -2, 3, -3).traverse(x => if (x >= 0) Some(x) else None)
res3: Option[List[Int]] = None