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:
