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Re: the '..' operator and decreasing values

by phroggy (Monk)
on Mar 05, 2005 at 00:25 UTC ( [id://436824]=note: print w/replies, xml ) Need Help??


in reply to the '..' operator and decreasing values

That's roughly equivalent to: 
for(my $i=10;$i<=0;$i++) {
  # do something
}

[download]

You can't use .. to count backwards, but try this: 

for my $i (reverse 0..10) {
  # do something
}

[download]
for $a(-2,12){for $b(0..7){$c=0;$_?hex substr(
ef7fa1866706caeff02289402844,2*$_+$a,2)&2**(7-$b):0
and $c+=2**(7-$_)for(0..7);print chr $c;}}

[download]

Replies are listed 'Best First'.
Re^2: the '..' operator and decreasing values
by jhourcle (Prior) on Mar 05, 2005 at 02:17 UTC

    You might prefer

    for ( my $i = 10; $i--; ) {
  # do something
}

    [download]

    I regularly walk array indexes backwards, as you can shave a few cycles off of the standard

    for ( my $i = 0; $i < $array_size; $i++ ) {
  # whatever
}

    [download]

    logic that people love using in those languages that don't have a 'foreach' command.

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