JavaScript: from small to capital letters, rounding numbers and check word length

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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:

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