"α".toUpperCase(); //=>"Α" "Α".toLowerCase(); //=>"α" "ω".toUpperCase(); //=>"Ω" "Ω".toLowerCase(); //=>"ω" "ψ".toUpperCase(); //=>"Ψ" "Ψ".toLowerCase(); //=>"ψ" "ա".toUpperCase(); //=>"Ա" "Ա".toLowerCase(); //=>"ա" "â".toUpperCase(); //=>"Â" "Â".toLowerCase(); //=>"â"