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Re: The Null Mull (or, when OO needs more O)

by elusion (Curate)
on Nov 29, 2004 at 16:31 UTC ( #410962=note: print w/replies, xml ) Need Help??


in reply to The Null Mull (or, when OO needs more O)

I couldn't turn up any great links on the subject, but Objective-C (as used in Apple's Cocoa development) uses this pattern. Calling a method on a nil object returns nil. It'd be similar to this Perl, which would print undefined:
# this would work if it were Objective-C # using Perl's syntax my $foo = undef; my $result = $foo->message; print "undefined\n" if not defined $result;
I happen to like it.

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[choroba]: $array[0]{key1}[1] {key2}
[thepkd]: ??
[GotToBTru]: I would think temporary variables would help in making the real life meaning of your structure clear
[choroba]: the problems start when you want to "skip a level", i.e. the arrays for all the keys
[LanX]: what are temps?
[moritz]: oh, the question was about creation, not indexing
[thepkd]: temporary variables
[moritz]: [ { a => [ { b => 1 } ] } ]
[choroba]: dereference ne creation
[choroba]: at least in my lingo

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