JavaScript base_convert

Converts a number in a string from any base <= 36 to any base <= 36

function base_convert (number, frombase, tobase) {
    // Converts a number in a string from any base <= 36 to any base <= 36  
    // 
    // version: 1008.1718
    // discuss at: http://phpjs.org/functions/base_convert    // +   original by: Philippe Baumann
    // +   improved by: Rafał Kukawski (http://blog.kukawski.pl)
    // *     example 1: base_convert('A37334', 16, 2);
    // *     returns 1: '101000110111001100110100'
    return parseInt(number + '', frombase | 0).toString(tobase | 0);}

external links: original PHP docs | raw js source

Examples

Running

1	base_convert('A37334', 16, 2);

Should return

1	'101000110111001100110100'

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 base_convert goodness in JavaScript.

Philippe Baumann ( original )
Rafał Kukawski ( improved )

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
Apr 23rd

@ Rafał Kukawski: Looking good!
http://github.com/kvz/phpjs/commit/419ceb08a367a7f2fb564ff0dc4e2cbf2bbffe96

Rafał Kukawski
Apr 22nd

I think, it would be better to handle arguments this way:

function base_convert(number, frombase, tobase){
return parseInt(number + '', frombase | 0).toString(tobase | 0);
}

frombase and tobase should be integers. When passing some other types, like float or a numeric string, PHP converts them to integer. The bitwise OR operator does more or less the same, converts the values to number and truncates the floating part of the number.
IMO, the conversion of number arguments to string is not that important, but I left it in place.

Kevin van Zonneveld
14 Dec '09

@ asd: You'd have to ask Philippe Baumann, but yes, +0 will make a difference and can prevent strange results when JavaScript automagically casts you an unexpected type : )

asd
3 Dec '09

What's the "+0" and "+''" for? I assume you're type-casting, but would it ever make a difference?

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