uniq:
+ self describing code
+ behavior is guaranteed by module docs
- needs a module (but I have it on our servers already)

grep:
- unobvious construct
- behavior might change in future versions of perl (although that's unlikely)
- declares auxiliary variable that might interfere with other code

The choice is quite obvious to me. :-)

In reply to Re^6: Order in which grep/map receive elements by abufct
in thread Order in which grep/map receive elements by abufct

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