ConvertReferenceToLambda

Reports a function reference expression that can be replaced with a function literal (lambda).

Sometimes, passing a lambda looks more straightforward and more consistent with the rest of the code. Also, the fix might be handy if you need to replace a simple call with something more complex.

Example:

fun Int.isEven() = this % 2 == 0

  fun example() {
      val numbers = listOf(1, 2, 4, 7, 9, 10)
      val evenNumbers = numbers.filter(Int::isEven)
  }

After the quick-fix is applied:

fun Int.isEven() = this % 2 == 0

  fun example() {
      val numbers = listOf(1, 2, 4, 7, 9, 10)
      val evenNumbers = numbers.filter { it.isEven() }
  }