Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl: the Markov chain saw
 
PerlMonks  

comment on

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

I completely agree with the {sentiment embodied in} the title of your meditation.

However, I think that the word "gratuitous" is important. If prototypes were truely evil, as opposed to just widely misunderstood (Poor things. All say "Ahhh!"), then I think they would have been officially deprecated long ago.

But they haven't. Maybe, because they do allow some things to be done that cannot be done any other way. And whilst you may question the necessity of doing those things, the desirability of them, when they are justified, is enough to keep them included in the langauge.

Example: Remove the prototype from this implementation of zip and then modify the code to compensate and you get a much less readable and useable function.

#! perl -slw use strict; local $, = ' | '; sub zip (&\@\@) { map { $_[ 0 ]->( $_[ 1 ][ $_ ], $_[ 2 ][ $_ ] ) } 0 .. ( @{$_[ 1 ]} < @{$_[ 2 ]} ? $#{ $_[ 1 ] } : $#{ $_[ 2 ] } ); } my @a = 'a' .. 'z'; my @n = 1 .. 10; print zip{ "@_" } @a, @n; print zip{ $_[ 0 ] .= $_[ 1 ] } @a, @n; print zip{ $_[ 0 ] .= $_[ 1 ] } @a, @n; __END__ [ 1:37:32.71] P:\test>406231 a 1 | b 2 | c 3 | d 4 | e 5 | f 6 | g 7 | h 8 | i 9 | j 10 a1 | b2 | c3 | d4 | e5 | f6 | g7 | h8 | i9 | j10 a11 | b22 | c33 | d44 | e55 | f66 | g77 | h88 | i99 | j1010

Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"Think for yourself!" - Abigail
"Memory, processor, disk in that order on the hardware side. Algorithm, algorithm, algorithm on the code side." - tachyon

In reply to Re: Gratuitous use of Perl Prototypes by BrowserUk
in thread Gratuitous use of Perl Prototypes by grantm

Title:
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?
Username:
Password:

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

How do I use this? | Other CB clients
Other Users?
Others exploiting the Monastery: (3)
As of 2021-10-24 00:59 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    My first memorable Perl project was:







    Results (88 votes). Check out past polls.

    Notices?