Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?
 
PerlMonks  

Re: Is A Number

by haukex (Bishop)
on Dec 17, 2021 at 20:27 UTC ( #11139692=note: print w/replies, xml ) Need Help??


in reply to Is A Number

hippo already pointed you to Scalar::Util's looks_like_number, which provides access to Perl's internal string-to-number conversion. kcott pointed out some of the potential pitfalls of that function, and just to add one more: for reasons, the string "0 but true" will also cause looks_like_number to return true, and it allows leading and trailing whitespace. Another thing to consider is for example whether you want to allow leading zeros, for example, some users may expect "077" to represent the integer 63 in octal, while others might simply expect this to be the integer 77 (the latter probably being more common among non-coders).

I just wanted to add that this is of course also a FAQ: How do I determine whether a scalar is a number/whole/integer/float? and that Regexp::Common::number provides more control over what strings you want to allow as numbers.

Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: note [id://11139692]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others avoiding work at the Monastery: (3)
As of 2022-05-28 20:21 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    Do you prefer to work remotely?



    Results (101 votes). Check out past polls.

    Notices?