Does JavaScript follow BOMDAS?

pheno

Hi all,

Studying for an exam and was wondering if JavaScript uses the BOMDAS rule?

So how would this calculate?

21 + 3 % 6 * 3 + 5?

What would be the answer to that and how did you come to that answer?

conor.hogan.2

Chrome, safari, firefox and IE (and Opera and others probably) come with a javascript console, so you could run "21 + 3 % 6 * 3 + 5" quicker than you could post this thread.

KonFusion

35

pheno

Thanks all.

How does this work parseInt("0xF");? or parseInt("A", 16);?

Ethan.Saaris

The answer to your first question is yes, Javascript follows the BODMAS rule by default. Try this in an HTML page:

<script>
// default Javascript BODMAS
document.write(21 + 3 % 6 * 3 + 5); // result is 35
document.write('<br>');

// separated percentage
document.write(21 + (3 % 6) * 3 + 5); // result is 35
document.write('<br>');

// separated percentage and multiplication
document.write(21 + ((3 % 6) * 3) + 5); // result is 35
document.write('<br>');
</script>

The answer to your second question is that both are correct:

"If the radix parameter is omitted, JavaScript assumes the following:

If the string begins with "0x", the radix is 16 (hexadecimal)
If the string begins with "0", the radix is 8 (octal). This feature is deprecated
If the string begins with any other value, the radix is 10 (decimal)"