Uppercase, which allows converting a text to uppercase except for those words whose first letter is already uppercase. Lowercase, which allows converting a text to lowercase, as long as the entered text is in uppercase. Extract, which allows extracting a word if the entered text consists of two or more words.

Script
function toUpperCase(string){
    return string.replace(/\w\S*/g, function(word){
        return word.charAt(0).toUpperCase() + word.substr(1).toLowerCase();
    });
}

function toLowerCase(string){
    return string.toLowerCase();
}

function extract(string){
    return string.split(" ")[0];
}