Re: Re: Re: Adult learning problem

[demerphq]

in reply to Re: Re: Adult learning problem
in thread Adult learning problem

A good way to get to know splice better is to re-implement push, pop, unshift and shift with it.

Uhm, or you could just read the docs :-)

D:\Development>perldoc -f splice
    splice ARRAY,OFFSET,LENGTH,LIST
    .....
            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)

A good way to get to know substr better is to create push/pop/unshift/shift functions for strings.

Well.... Once you know how to implement splice using susbtr you dont need to implement push/pop/unshift or shift, but its true it might be a good exercise. Personally would suggest taking that thought a step further and reimplement Tie::CharArray, by the time you are done if you dont understand Tie's, Array implementation, Splice Implementation and Substr implementation then I would say theres something very wrong... (either with the individual or the code ;-) Oh and it probably is a good idea because you can use the CPAN module for a proper code comparison and review afterward.

Thats what I did to learn Tie the first time anyway... :-)

Yves / DeMerphq
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Writing a good benchmark isnt as easy as it might look.