Using return in a map returns from the enclosing subroutine. Cf: 
say for sub { map { "\U$_" } @_ } ->(qw( abc def ghi ));
# ABC
# DEF
# GHI

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versus 

say for sub { map { return "\U$_" } @_ } ->(qw( abc def ghi ));
# ABC

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and even 

say for map { return "\U$_" } qw( abc def ghi );
# Can't return outside a subroutine at -e line 1.
# [255]

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($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

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In reply to Re^4: Extracting elements from array by choroba
in thread Extracting elements from array by Anonymous Monk

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