Re^3: iterating through array and saving matches to new array

Wouldn't the code be more readable/maintainable/etc with List::Util::uniq():
my @newb = uniq grep $_ > 850, @b, @c, @d;
Results are the same per Test::More::is_deeply(). (In older Perls, see List::MoreUtils::uniq.)

Give a man a fish: <%-{-{-{-<

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Re^4: iterating through array and saving matches to new array by Marshall (Canon) on Apr 19, 2018 at 23:05 UTC
Yes, actually it would be. Although I would still prefer the block form of grep. I show how to use map{} It actually took me quite a while to learn how to return "nothing" instead of "undef" from a map.	[reply]
Re^5: iterating through array and saving matches to new array by AnomalousMonk (Archbishop) on Apr 20, 2018 at 01:29 UTC
... how to return "nothing" instead of "undef" from a map. That is a bit tricky :) Give a man a fish: `<%-{-{-{-<`	[reply] [d/l]
Re^6: iterating through array and saving matches to new array by Marshall (Canon) on Apr 20, 2018 at 02:56 UTC
I use grep to get a subset of an array. I use map to transform an array into another array. Special syntax for map can be used to do both, in certain situations. UPDATE: I have now forgotten the exact code that I used to "return nothing", but something like this (untested) should work: `map{some condition ? $val : ()}@array;` [download] This () is not "undefined", it is absolutely nothing. Of course it it possible to combine map and grep to filter out undefined values. I remember doing this for some reason, but it's been a few years. If someone wants to do this, just knowing that it is possible will get you started. perl doc map for more info.	[reply] [d/l]
Re^7: iterating through array and saving matches to new array by AnomalousMonk (Archbishop) on Apr 21, 2018 at 20:16 UTC
Re^8: iterating through array and saving matches to new array by Marshall (Canon) on Apr 23, 2018 at 20:40 UTC
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