title: What does _ parameter in Kotlin Lambda
body: <p>What does the following _ mean in a Kotlin lamda?</p>
  <pre><code>DatePickerDialog.OnDateSetListener {
              _: DatePicker, year: Int, month: Int, day: Int -&gt;
  
          val resultDate : Date = GregorianCalendar(year, month, day).time
  
          targetFragment?.let { fragment -&gt;
              (fragment as Callbacks).onDateSelected(resultDate)
          }
  }
  </code></pre>
  <p>I am guessing it means a nameless lambda  parameter which will be unused, but I am not sure and cannot find it using Google.</p>