Function to bind functionToBind have two parameters SidechainNodeView and T. However Akka route could accept only function with one input parameter T. Where T is object created from HTTP request. So we need to convert our (SidechainNodeView, T) -> ApiResponse function to T -> ApiResponse. We do it in the next way: 1. We have function applyBiFunctionOnSidechainNodeView(T functionParameter, BiFunction<SidechainNodeView, T, ApiResponse> func) which take as input functionToBind parameter and functionToBind itself 2. Function applyBiFunctionOnSidechainNodeView know the proper way to apply functionToBind on SidechainNodeView with functionParameter 3. We create new anonymous transformed function based on applyBiFunctionOnSidechainNodeView by partially applying functionToBind on applyBiFunctionOnSidechainNodeView, in other words we create anonymous function object which save functionToBind function as internal variable and expect input parameter T and use way described in applyBiFunctionOnSidechainNodeView. 4. Anonymous transformed function is used for creating Akka route as in previous createAkkaRoute function.