Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
Ingy needed a pure Perl method of determining if a scalar contained an integer or a string
While his results are cool, he could have saved a lot of work if he'd asked around to see if anyone had already found a solution to this problem (note the unary "~", it's important)
sub is_integer { ~$_[0] !~ /\D/ }
Here are some tests to demonstrate that it works:
#!/usr/bin/perl -wT use strict; use Test; BEGIN { plan tests => 345 } for my $num (-56789, -300, -1, 0..100, 5345, 6574572, 23457356) { ok( is_integer($num) ); my $string = "$num"; ok( not is_integer($string) ); } for my $string ((map { chr($_) } 0..127), 'dog', 'cat', 'mouse') { ok( not is_integer($string) ); } sub is_integer { ~$_[0] !~ /\D/ }
I found the is_integer() implementation in my cool-snippets-from-perlmonks directory, but can't seem to find the original thread.....

-Blake


In reply to Re3: Pure Perl Internals (with Pure Perl Segfaults) by blakem
in thread Pure Perl Internals (with Pure Perl Segfaults) by Ovid

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others perusing the Monastery: (10)
    As of 2015-07-03 17:24 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (54 votes), past polls