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➜ MUSHclient
➜ Lua
➜ is_numeric?
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Posted by
| Katie Love
(19 posts) Bio
|
Date
| Tue 24 Feb 2009 03:17 AM (UTC) |
Message
| Is there a lua equivalent to the php is_numeric()?
http://us2.php.net/is_numeric
I've been searching Google and these forums with no luck...
Any thoughts would be very helpful!
Thanks :-) | Top |
|
Posted by
| WillFa
USA (525 posts) Bio
|
Date
| Reply #1 on Tue 24 Feb 2009 03:18 AM (UTC) |
Message
| if tonumber(x) then ...
tonumber() returns a number or nil if it can't convert. | Top |
|
Posted by
| Nick Gammon
Australia (23,100 posts) Bio
Forum Administrator |
Date
| Reply #2 on Tue 24 Feb 2009 03:30 AM (UTC) |
Message
| I agree with Willfa, that is an easy way.
However a bit depends on what you define as "numeric" in your application.
For example:
print (tonumber ("0xff")) --> 255
print (tonumber ("1e6")) --> 1000000
The value "0xff" is considered a numeric literal in Lua, and hence it converts. If you are really asking "how to test for 0 to 9 with an optional leading sign, you may be better off with a regular expression (ie. string.match). |
- Nick Gammon
www.gammon.com.au, www.mushclient.com | Top |
|
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