[Javascript] Force String to Float?
Peter Brunone
peter at brunone.com
Tue May 15 11:34:22 CDT 2007
Cheers Nick; it's been a while since I read up on that subject.
----------------------------------------
From: Nick Fitzsimons nick at nickfitz.co.uk
On 15 May 2007, at 17:12:13, Peter Brunone wrote:
> I know that parseInt has a default number base of 8, so you want to
> specify that second parameter -- e.g. parseInt(myNum, 10) -- to
> make sure numbers get parsed correctly... maybe the same thing is
> true of parseFloat...?
Not quite ;-)
"parseInt(string, radix)" will parse a string into a number according
to the following rules:
if the radix is specified, it will be used as the numeric base in
which the string is to be parsed;
if the radix is not specified or is zero:
if the string begins with the string "0x" (zero followed by x) it
will be parsed as hexadecimal (radix 16);
if the string begins with the character "0" (zero), it will be
parsed as octal (radix 8);
otherwise it will be parsed as decimal (radix 10).
So although it is always good practice to specify the radix, it is
not true that the default radix is 8: the default radix is dependent
on the input.
"parseFloat" does not accept a radix, or indeed any second argument.
As a general rule, unless you know for a fact that people will be
entering non-integral numbers, or will be entering integral numbers
in a variety of radices specified according to the rules outlined
above, you should use "parseInt" and always specify a radix of 10.
Regards,
Nick.
--
Nick Fitzsimons
http://www.nickfitz.co.uk/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.evolt.org/pipermail/javascript/attachments/20070515/2e110742/attachment.htm>
More information about the Javascript
mailing list