Also const the return?

[Aaron_Stackpole]

Near the end we fix the function const correctness, but shouldn’t you also const the return value?

bool const UBullCowCartridge::IsIsogram(const FString& word) const {}

Seems like we should let the calling scope know it cannot mutate our return value, either!

[DanM]

This is being returned by value so callers would still be able to modify their variable they store this in (provided it’s non-const obviously).

Returning by const value is rarely what you ever want as it disables move semantics.