splice - add or remove elements anywhere in an array
splice ARRAY,OFFSET,LENGTH,LIST
splice ARRAY,OFFSET,LENGTH
splice ARRAY,OFFSET
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 start that far from the end of the array. If
LENGTH is omitted, removes everything from
OFFSET onward. If
LENGTH is negative, leave that many elements off the end of the array. 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)) { ... }
If rather than formatting bugs, you encounter substantive content errors in these documents, such as mistakes in the explanations or code, please use the perlbug utility included with the Perl distribution.