It’s probably pretty similar to what you other guys have, but I tried to comment it heavily if somebody have some questions about it.
bool FBullCowGame::IsIsogram(FString Word) const
{
// treat 0 and 1 letter words as isogram
if (Word.length() <= 1) { return true; }
TMap<char, bool> LetterSeen; // setup our map
for (auto Letter : Word) // for all letters of the word
{
Letter = tolower(Letter); // handle mixed case
if (LetterSeen[Letter]) // Have we seen the letter before? A map is initally populated with bool = false for values that haven't been specified
{ // Yes, we have, so...
return false; // ...let's return false to state that it isn't an isogram
}
else { // No, we haven't, so...
LetterSeen[Letter] = true; // ...let's make a note of the letter we are checking in the map by setting its value to true
}
}
return true; // Yes, the word is an isogram and we return true
}
And now I hope I did it correct 