Re: Non-destructive array processing

Another alternative, which I think I prefer. Best thing is you don't get "Use of uninitialized value in join or string at ..." if the array size isn't an exact multiple of the chunk size.

sub getIter (\@$;$) {
    my ($ref, $size, $next) = @_;
    $next ||= 0;
    return sub {
        $next = 0, return () unless $next <= $#$ref;
        my $start = $next;
        $next = $next+$size <= $#$ref ? $next+$size-1 : $#$ref;
        @$ref[ $start .. $next++  ]
    }
}

my $iter = getIter( @array, 2 );
while( my @chunk = $iter->() ) {
    print "Chunk: @chunk";
}
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Comment on Re: Non-destructive array processing Download Code

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Re: Re: Non-destructive array processing by dragonchild (Archbishop) on Jan 21, 2003 at 16:21 UTC
In what context would you use the `$next` variable? It looks to be useful only for setting a first value to return. (Sorta like "Skip the first N values" thingy...) Is that what it is? ------ We are the carpenters and bricklayers of the Information Age. Don't go borrowing trouble. For programmers, this means Worry only about what you need to implement.	[reply] [d/l]
Re: Re: Re: Non-destructive array processing by BrowserUk (Patriarch) on Jan 21, 2003 at 17:28 UTC
That's it exactly. Skip the $first n and then give'm to me in chunks of $size after that. Examine what is said, not who speaks. The 7th Rule of perl club is -- pearl clubs are easily damaged. Use a diamond club instead.	[reply]
Re: Re: Non-destructive array processing by Juerd (Abbot) on Jan 21, 2003 at 19:30 UTC
Best thing is you don't get "Use of uninitialized value in join or string at ..." if the array size isn't an exact multiple of the chunk size. I want those warnings. If the array length is not an exact multiple of the chunk size, something is wrong, and I would like to be informed. In production code, I'd let it croak if @array % 2 even before looping. Juerd - http://juerd.nl/ - spamcollector_perlmonks@juerd.nl (do not use).	[reply]


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