test.js

function deleteCommentsByName(index, numComments, TXTextControl, name) {
    
    if (index >= numComments) {
        return;
    }

    TXTextControl.comments.elementAt(index, (comment) => {
        comment.getUserName((author) => {
            if (author === name) {
                TXTextControl.comments.remove(comment, () => {
                    TXTextControl.comments.getCount((newNumComments) => {
                        deleteCommentsByName(0, newNumComments, TXTextControl, name);
                    });
                });
            } else {
                deleteCommentsByName(index + 1, numComments, TXTextControl, name);
            }
        });
    });
}

TXTextControl.comments.getCount((numComments) => {
    deleteCommentsByName(0, numComments, TXTextControl, "Tim Typer");
});