A third option is 
my $var2 = do {
  if ( <cond1>  ) {
     a;
  } else {
     y;
  }
};

[download]

All three constructs are more-or-less interchangable and which one you use should be decided based on which is most readable in any particular instance.

In reply to Re^3: Variable Declaration by nobull
in thread Variable Declaration by pp

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