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aoiroaoino/foo.scala

Created March 16, 2017 10:09
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foo.scala
import monocle.Lens
case class Foo(bar: Option[String])
val _bar = Lens[Foo, Option[String]](_.bar)(s => foo => foo.copy(bar = s))
def いい感じにする(foo: Foo)(s: String): Foo = _bar.modify(bar => bar orElse Some(s))(foo)
// scala> いい感じにする(Foo(Some("bbb")))("aaa")
// res0: Foo = Foo(Some(bbb))
// scala> いい感じにする(Foo(None))("aaa")
// res1: Foo = Foo(Some(aaa))
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