--- Pedro A Reche Gallardo <[EMAIL PROTECTED]> wrote:
> Hi all,
> Is it possible to delete an array element changing the array size at
> the same time?
> if I do $array[$i]= undef; the value is gone but the size of the
> array remains the same?!
see perldoc -f splice:
splice ARRAY,OFFSET,LENGTH,LIST
splice ARRAY,OFFSET,LENGTH
splice ARRAY,OFFSET
splice ARRAY
Removes the elements designated by OFFSET and LENGTH from an array,
and replaces them with the elements of LIST, if any. In list
context, returns the elements removed from the array. In scalar
context, returns the last element removed, or undef if no elements
are removed. The array grows or shrinks as necessary. If OFFSET is
negative then it starts that far from the end of the array. If
LENGTH is omitted, removes everything from OFFSET onward. If LENGTH
is negative, leaves that many elements off the end of the array.
If both OFFSET and LENGTH are omitted, removes everything.
The following equivalences hold (assuming $[ == 0):
push(@a,$x,$y) splice(@a,@a,0,$x,$y)
pop(@a) splice(@a,-1)
shift(@a) splice(@a,0,1)
unshift(@a,$x,$y) splice(@a,0,0,$x,$y)
$a[$x] = $y splice(@a,$x,1,$y)
Example, assuming array lengths are passed before arrays:
sub aeq { # compare two list values
my(@a) = splice(@_,0,shift);
my(@b) = splice(@_,0,shift);
return 0 unless @a == @b; # same len?
while (@a) {
return 0 if pop(@a) ne pop(@b);
}
return 1;
}
if (&aeq($len,@foo[1..$len],0+@bar,@bar)) { ... }
=====
print "Just another Perl Hacker\n"; # edited for readability =o)
=============================================================
Real friends are those whom, when you inconvenience them, are bothered less by it than
you are. -- me. =o)
=============================================================
"There are trivial truths and there are great Truths.
The opposite of a trival truth is obviously false.
The opposite of a great Truth is also true." -- Neils Bohr
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