result-of-extensions-usage.kt

/* Copyright 2020 Seanghay Yath (@seanghay)
   SPDX-License-Identifier: Apache-2.0 */
   
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
  viewModel.posts.observe(viewLifecycleOwner, Observer {result ->
    
    result.doIfSuccess {items ->
      adapter.submitList(items)
    }                                             
    
    result.doIfFailure {message, throwable ->
       showErrorMessage(message ?: "Unknown error message")                    
    }
  })
}