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Does JavaScript follow BOMDAS?

  • 21-05-2013 09:23PM
    #1
    pheno
    Closed Accounts Posts: 79 ✭✭


    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?


Comments

  • #2
    [Deleted User]
    Posts: 0 ✭✭✭ [Deleted User]


    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.


  • #3
    KonFusion
    Registered Users, Registered Users 2 Posts: 2,559 ✭✭✭KonFusion


    35


  • #4
    pheno
    Closed Accounts Posts: 79 ✭✭pheno


    Thanks all.

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


  • #5
    Ethan.Saaris
    Registered Users, Registered Users 2 Posts: 101 ✭✭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)"


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