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Re: [splice], explanation please?

by bamy787 (Novice)
on Nov 17, 2002 at 13:09 UTC ( #213551=note: print w/replies, xml ) Need Help??

in reply to [splice], explanation please?

splice ARRAY, OFFSET, LENGTH, LIST splice ARRAY, OFFSET, LENGTH splice ARRAY, OFFSET This function removes the elements designated by OFFSET and LENGTH fro +m an array, and replaces them with the elements of LIST, if any. The +function returns the elements removed from the array. The array grows + or shrinks as necessary. If LENGTH is omitted, the function removes +everything from OFFSET onward. The following equivalences hold (assum +ing $[ is 0): Direct Method Splice Equivalent --------------------------------------------------- push(@a, $x, $y) | splice(@a, $#a+1, 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, $y); The splice function is also handy for carving up the argument list pas +sed to a subroutine. For example, assuming list lengths are passed be +fore lists: sub list_eq { # compare two list values my @a = splice(@_, 0, shift); my @b = splice(@_, 0, shift); return 0 unless @a == @b; # same len? while (@a) { return 0 if pop(@a) ne pop(@b); } return 1; } if (list_eq($len, @foo[1..$len], scalar(@bar), @bar)) { ... } It would probably be cleaner just to use references for this, however.

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