The conversation between human and AI assistant.
How do I determine if a string has all unique characters?
That looks fairly simple. Can you explain how it works?
Absolutely. The function creates an empty set called `unique_chars`. It then iterates through each character in the string. If a character is already in the `unique_chars` set, that means it's not unique and the function returns `False`. Otherwise, it adds the character to the set and continues to the next character. If the function makes it through the entire loop, that means all characters in the string are unique and it returns `True`.