title: In Android Kotlin, when creating a dialog, the samples I've seen include "_, _ ->" what does that mean or do?
body: <p>The tutorial I'm working on gives this code:</p>
  <pre><code>private fun showFinalScoreDialog() {
      MaterialAlertDialogBuilder(requireContext())
          .setTitle(getString(R.string.congratulations))
          .setMessage(getString(R.string.you_scored, viewModel.score))
          .setCancelable(false)
          .setNegativeButton(getString(R.string.exit)) { _, _ -&gt;
              exitGame()
          }
          .setPositiveButton(getString(R.string.play_again)) { _, _ -&gt;
              restartGame()
          }
          .show()
  }
  </code></pre>
  <p>The tutorial took this moment to explain &quot;trailing lambda syntax&quot;, but didn't bother to explain the actual content of the lambda. The part that I'm clueless on is <code>_, _ -&gt;</code> what is this? What does it do?</p>
  <p>The tutorial says &quot;...the <code>setNegativeButton()</code> method takes in two parameters: a String and a function, <code>DialogInterface.OnClickListener()</code>...&quot;</p>