Sort an array of strings alphabetically

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Javascript

I would need to sort an array of letters considering the case of each string, to be more specific, I want upper case letters to go first, how can I do this? I found a solution that handles this but there is one bug that I don`t know how to fix:

var arr = ["T", "h", "e", "c", "a", "t", "s", "a", "t", "o", "n", "t", "h", "e", "m", "a", "t"];
arr.sort(function(a, b)
{
    var x = a.toLowerCase(), y = b.toLowerCase();
    
    if(x < y) {return -1}
    else if (x > y ) {return 1} 
    else {return 0};
}); //-> ["a", "a", "a", "c", "e", "e", "h", "h", "m", "n", "o", "s", "t", "T", "t", "t", "t"]

Why won`t the capital t be first on the list of 'T'`s, like this :

["a", "a", "a", "c", "e", "e", "h", "h", "m", "n", "o", "s",  "T", "t", "t", "t", "t"]

P.S I am sorry for previous confusing question. I am trying to sort an array according to the case.

What I have tried:

.sort(function (a, b) {
    return a.toLowerCase().localeCompare(b.toLowerCase());
});

The output is the same