leaving out some implicit parameters

Question

Is it possible to leave out some implicit parameters but not all of them? I tried with named parameters:

def foo(implicit a: Int, b: String) {
  if (a > 0         


        

Answer 1

It is not possible to leave out some implicit parameters. So, in your example

def foo(implicit a: Int, b: String): Unit = ???

It is not possible to only specify a. However, you can specify the default value of the implicit parameter, for example

def foo(implicit a: Int, b: String = "---"): Unit = ???

Where if b is not implicitly available, "---" will be used.

Remember that the implicit keyword marks the parameter list as implicit, not that one parameter as implicit.