JavaScript
Changing from small to capital letters, rounding numbers and checking word length.
<!DOCTYPE html> <script> var a = "hello world"; var b = 3.14159; a.length; a.toUpperCase(); b.toFixed(4); document.write("a.length: " + a.length + "<br>" + "a.toUpperCase(): " + a.toUpperCase() + "<br>" + "b.toFixed(4): " + b.toFixed(4) ); </script> </html>
Result: