JavaScript decbin

Returns a string containing a binary representation of the number

function decbin (number) {
    // Returns a string containing a binary representation of the number  
    // 
    // version: 909.322
    // discuss at: http://phpjs.org/functions/decbin    // +   original by: Enrique Gonzalez
    // +   bugfixed by: Onno Marsman
    // +   improved by: http://stackoverflow.com/questions/57803/how-to-convert-decimal-to-hex-in-javascript
    // +   input by: pilus
    // +   input by: nord_ua    // *     example 1: decbin(12);
    // *     returns 1: '1100'
    // *     example 2: decbin(26);
    // *     returns 2: '11010'
    // *     example 3: decbin('26');    // *     returns 3: '11010'
    if (number < 0) {
        number = 0xFFFFFFFF + number + 1;
    }
    return parseInt(number, 10).toString(2);}

external links: original PHP docs | raw js source

Examples

» Example 1

Running

1	decbin(12);

Should return

'1100'

» Example 2

Running

1	decbin(26);

Should return

'11010'

Dependencies

No dependencies, you can use this function standalone.

Open syntax issues

php.js uses JsLint to help us keep our code consistent and prevent some common bugs.

Eventually we want all code to pass or at least take into consideration most fixes suggested by JsLint, following this JsLint configuration we’ve decided on.

Authors

Thanks to the following developers, you get to have decbin goodness in JavaScript.

Enrique Gonzalez ( original )
Onno Marsman ( bugfixed )
http://stackoverflow.com/questions/57803/how-to-convert-decimal-to-hex-in-javascript ( improved )
pilus ( input )
nord_ua ( input )

Comments

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Use:

[CODE]
your_stuff('here');
[/CODE]

for proper code formatting
By submitting code here you are allowing us to use it in php.js hence dual licensing it under the MIT and GPL licenses

Kevin van Zonneveld
16 Aug '09

@ Tim de Koning: Thanks for pointing that out.

Tim de Koning
6 Aug '09

Please note that there is a difference between the handling of large numbers in different browsers. e.g.

IE8

1 2	>>decbin(3747030078639374300) "1.101000000000000100000000000010000000000000001(e+61)"

Firefox 3.5

1 2	>>> decbin(3747030078639374300) "11010000000000001000000000000100000000000000010000000000000000"

This is caused by the fact that Number.toString(2) doesn't work in IE for numbers written in scientific notation internally.

Brett Zamir
5 Aug '09

@nord_ua: Thanks for the report! Fixed in SVN...

nord_ua
4 Aug '09

1	decbin(-3)

-11

ben
6 Nov '08

wow!!! so cool!!!

Onno Marsman
4 Oct '08

decbin('8') does not work correctly. A fix:

1
2
3

function decbin(number) {
    return parseInt(number).toString(2);
}

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