Slicy (Pretty efficient): 
   my @fifth =  @arr[ map {$_*5-1} 1..$#arr+4/5 ];

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Update: See gmargo's (++) correction below.

     Potentia vobiscum ! (Si hoc legere scis nimium eruditionis habes)

In reply to Re: how to push 5th element from one array to another array by NetWallah
in thread how to push 5th element from one array to another array by Anonymous Monk

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