Underscore placeholders for convenient closure syntax
Underscores provides a macro @_ for passing closures to functions by
interpreting _ placeholders as anonymous function arguments. For example@_ map(_+1, xs) means map(x->x+1, xs).
Underscores is useful for writing anonymous functions succinctly and without
naming the arguments. This is particular useful for data processing pipelines
such as
@_ people |> filter(_.age > 40, __) |> map(_.name, __)
Read the documentation for
more information, or see the online help for the @_ macro.