I just realized recently that you can convert between number bases in JavaScript using the built in method Object.prototype.toString() and parseInt().

Math.base = function(n, to, from) {
     return parseInt(n, from || 10).toString(to);
}

For example, to convert from decimal to hex, or hex to decimal:

// convert the decimal 10 to hex
Math.base(10, 16); // 'a'

// convert the hex 'a' to decimal
Math.base('a', 10, 16); // 10
// or
Math.base(0xA, 10); // 10

Or from hex or dec to binary:

// convert the decimal 10 to binary
Math.base(10, 2); // '1010'

// convert the hex 'a' to decimal
Math.base('a', 2, 16); // 1010

This should work for bases between 2 and 36. ie: the number of characters from 0-9a-z.

Edit: changed base() to Math.base() for better namespace

I’ve also added base conversion in PHP up to a radix of 255.

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