My Implementation of IsIsogram()

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bool FBullCowGame::IsIsogram(FString Word) const
{
	// treat 0 and 1 letter words as isograms
	if (Word.length() <= 1) { return true; }

	TMap <char, bool> LetterSeen; // setup our map
	for (auto Letter : Word) // for all letters of our word
	{
		Letter = tolower(Letter); // handle mixed case
		// loop thru letters
			// if the letter is in the map break from the loop
		if (LetterSeen.find(Letter) != LetterSeen.end()) {
			return false; // it isnt an isogram
		}
		else
		{
			LetterSeen.insert({ Letter, true });// add the letter to the map
		}
	}
	return true; // weird cases like /0 always go through this test alive
}