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perlfunc:splice

by gods
on Aug 24, 1999 at 22:42 UTC ( #275=perlfunc: print w/ replies, xml ) Need Help??

splice

See the current Perl documentation for splice.

Here is our local, out-dated (pre-5.6) version:


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)) { ... }

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