Tilde in Scala found in Scalatra example code

Question

Just ran into this sample code learning about Commands in Scalatra:

 protected def handle: Handler  = {
    case c: CreateTodoCommand => 
      add(newTodo(~c.name.value))
  }

In this particular case, what exactly is the relevance of ~ in ~c.name.value? Not sure where to find more documentation on this particular symbol.

Answer 1

In Scala:

~x

translates to

x.unary_~

(this also applies to +,- and ! as explained in this post). So your example translates to:

add(newTodo(c.name.value.unary_~))

The documentation can hence be found at the type of value.