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Hello,
With code below, I make the first letter of any word uppercase, except the words that are in the array wordsToIgnoreand wordContainAt.
Now I thought to update the code and include an array called wordUpperCase, where the words that are in this array will be completely uppercase.
Example: let wordUppercase = ['LTDA', 'S.A']
I tried to use the following if, but to no avail.
if (wordUpperCase.indexOf($.trim(word)) != -1) {
    words[i] = words[i].toUpperCase();
}
Below is the code along with an example
$(window).on('load', function() {
    $.fn.capitalize = function() {
        // words to ignore
        let wordContainAt = '@',
            wordsToIgnore = ['to', 'and', 'the', 'it', 'or', 'that', 'this', 'dos', 'rua', 'das', 'rh'],
            minLength = 2;
        function getWords(str) {
            if (str == undefined) {
                str = 'abc def';
            } else {
                str = str;
            }
            return str.match(/\S+\s*/g);
        }
        this.each(function() {
            let words = getWords(this.value);
            $.each(words, function(i, word) {
                // only continues if the word is not in the ignore list or contains at '@'
                if (word.indexOf(wordContainAt) != -1) {
                    words[i] = words[i].toLowerCase();
                } else if (wordsToIgnore.indexOf($.trim(word)) == -1 && $.trim(word).length > minLength) {
                    words[i] = words[i].charAt(0).toUpperCase() + words[i].slice(1).toLowerCase();
                } else {
                    words[i] = words[i].toLowerCase();
                }
            });
            if (this.value != '') {
                this.value = words.join('');
            }
        });
    };
    // field onblur with class .title
    $(document).on('blur', '.lower', function() {
        $(this).capitalize();
    }).capitalize();
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="text" class="lower">
Have this old post on SOPT talking about it who knows doesn’t help? https://answall.com/questions/224603/como-deixara-primeira-letra-mai%C3%Bascula
– Margot Paon Garcia