as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
write a function that checks a string for all unique characters.
user
function uniquecharacters(string) { 
    
    let unique = true; 
    
    for (let i = 0; i < string.length; i++) { 
        for (let j = i + 1; j < string.length; j++) { 
            if (string[i] == string[j]) { 
                unique = false; 
            } 
        } 
    } 

    return unique; 
}
assistant