function log-demo
    log-t "This is a" "[t]race (60)" "log."
    log-d "This is a" "[d]ebug (50)" "log."
    log-i "This is a" "[i]nformation (40)" "log."
    log-s "This is a" "[s]uccess (30)" "log."
    log-w "This is a" "[w]arning (20)" "log."
    log-e "This is a" "[e]rror (10)" "log."
    log-f "This is a" "[f]atal (0)" "log."
end