Why cannot I pass a function reference to `Iterabl...
# getting-startedl
Lukasz Kalnik
11/09/2023, 12:21 PMWhy cannot I pass a function reference to
Iterable<T>.sortedBy() Copy code
fun mySort(uiState: UiState): Int = // sort based on some criteria
val uiStates: List<UiState>
uiStates.sortedBy(mySort) // doesn't compile: Function invocation `mySort(...)` expected; No value passed for parameter `uiState`Lukasz Kalnik
11/09/2023, 12:26 PMOK, forgot that function references need to be prefixed with a double colon 🤦
This works:
Copy code
uiStates.sortedBy(::mySort)😄 2
rubber duck 5
t
Travis Griggs
11/10/2023, 12:51 AMok... 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)
l
Lukasz Kalnik
11/10/2023, 8:05 AMIt'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
🙏 1