perl 101 subroutine and return value -

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i don't understand how return 4 answer. not sure happening inside subroutine.

  sub bar {@a = qw (10 7 6 8);} $a = bar();  print $a;   # outputs 4

the subroutine called in scalar context. last statement in subroutine assignment @a, expression , becomes implied return value. in scalar context, evaluates number of elements returned assignment's right-hand side (which happens same number of elements in @a).


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