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  1. or download this
    my $t = 1;
    grep { $t^=1 } LIST
    
  2. or download this
    my $t = 1;
    grep { $t = 1-$t } LIST
    
  3. or download this
    my $t = 1;
    grep { ++$t % 2 } LIST
    
  4. or download this
    map { $_%2 ? $ARRAY[$_] : () } 0..$#ARRAY
    
  5. or download this
    >perl -le"$t=1; print grep { $t^=1 } qw( a b c d e );"
    bd
    
  6. or download this
    >perl -le"$t=1; print grep { $t = 1-$t } qw( a b c d e );"
    bd
    
  7. or download this
    >perl -le"$t=1; print grep { ++$t % 2 } qw( a b c d e );"
    bd
    
  8. or download this
    >perl -le"@a = qw( a b c d e ); print map { $_%2 ? $a[$_] : () } 0..$#
    +a;"
    bd
    
  9. or download this
    my $t = 0;
    grep { $t^=1 } LIST
    
  10. or download this
    my $t = 0;
    grep { $t=1-$t } LIST
    
  11. or download this
    my $t = 0;
    grep { ++$t % 2 } LIST
    
  12. or download this
    map { $_%2 ? () : $ARRAY[$_] } 0..$#ARRAY
    
  13. or download this
    >perl -le"$t=0; print grep { $t^=1 } qw( a b c d e );"
    ace
    
  14. or download this
    >perl -le"$t=1; print grep { $t = 1-$t } qw( a b c d e );"
    ace
    
  15. or download this
    >perl -le"$t=0; print grep { ++$t % 2 } qw( a b c d e );"
    bd
    
  16. or download this
    >perl -le"@a = qw( a b c d e ); print map { $_%2 ? () : $a[$_] } 0..$#
    +a;"
    ace
    
  17. or download this
    my $t = 1;
    map { ($t^=1) ? EXPR_FOR_ODD : EXPR_FOR_EVEN } LIST
    
  18. or download this
    my $t = 1;
    map { ($t = 1-$t) ? EXPR_FOR_ODD : EXPR_FOR_EVEN } LIST
    
  19. or download this
    my $t = 1;
    map { (++$t % 2) ? EXPR_FOR_ODD : EXPR_FOR_EVEN } LIST
    
  20. or download this
    map { $_%2 ? EXPR_FOR_ODD : EXPR_FOR_EVEN } 0..$#ARRAY
    
  21. or download this
    >perl -le"$t=1; print map { ($t^=1) ? uc : lc } qw( a b c d e );"
    aBcDe
    
  22. or download this
    >perl -le"$t=1; print map { ($t=1-$t) ? uc : lc } qw( a b c d e );"
    aBcDe
    
  23. or download this
    >perl -le"$t=1; print map { (++$t % 2) ? uc : lc } qw( a b c d e );"
    aBcDe
    
  24. or download this
    >perl -le"@a = qw( a b c d e ); print map { $_%2 ? uc($a[$_]) : lc($a[
    +$_]) } 0..$#a;"
    aBcDe