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

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

As a beginner, I made all of these mistakes and then some. Thank you chromatic for this excelent node, and dominus for the Red Flag papers. While forcing myself to rewrite a script to have them all  use strict I came up with the following solutions which may be of benefit to others like me (for most of you this is way too trivial, but this is the voice of a beginner).

To access a number of files in a loop construct, this was my initial attempt:

for ($results = 2; $results <34; $results++) { my $file="current$results.res"; open (TALLYRESULTS, ">$file") or die ("cant open results f +ile"); .... }

A common mistake, apparently, which turned out to be easy to avoid:

for ($results = 2; $results <34; $results++) { my $file="current".$presence.".res"; .... }

Another (double!) 'Red Flag' situation was this:

@tree1=@samples[0..2]; ... (another 10 of those) @tree12=@samples[33..35]; for ($z = 1; $z <= 12; $z++) { $arrayname="tree$z"; foreach $patch(@$arrayname) { ... do something }

and solving it taught me a thing or two about hashes:

my %trees = (1 => "@samples[0..2]", ... (another 10 of these) 12 => "@samples[33..35]", ); while ((my $tree, my $samples) = each (%trees) ){ my @patches = split (/ */, $samples); foreach $patch(@patches) { ... do something }

My script now runs under strict, and I'm proud of it ;-)

In reply to Re: Common Beginner Mistakes by Elias
in thread Common Beginner Mistakes by chromatic

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

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?

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

How do I use this? | Other CB clients
Other Users?
Others wandering the Monastery: (3)
As of 2022-08-10 22:27 GMT
Find Nodes?
    Voting Booth?

    No recent polls found