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kotlinlang

Why cannot I pass a function reference to `Iterable&lt;T&gt;.sortedBy()`?
```fun mySort(uiState: UiState): Int = // sort based on some criteria

val uiStates: List&lt;UiState&gt;

uiStates.sortedBy(mySort) // doesn't compile: Function invocation `mySort(...)` expected; No value passed for parameter `uiState````

OK, forgot that function references need to be prefixed with a double colon :face_palm:
This works:
```uiStates.sortedBy(::mySort)```

ok... why a rubber duck emoji? I'm missing a cult reference here. or at least how it applies (I'm running through the James Veitch duck sketch and trying to figure out how that apply here)

It's a debugging technique, where you explain the problem to yourself loud (e.g. talking at a rubber duck) to find a solution:
<https://en.wikipedia.org/wiki/Rubber_duck_debugging>