On Thu, May 29, 2014 at 3:20 PM, James Kerwin <jkerwin2...@gmail.com> wrote:
> Explain the difference between:
>
> ($test)=(@test);
>
> And
>
> $test=@test;
>
Parens on the left make it a "list" context, parens on the right make it a
list.
Bare scalar on the left make it "scalar context, bare array assigned in a
scalar context return a scalar - that is, the number of elements. So, in
the first, @test gets unrolled to a list of elements and assigned in list
context, the first element gets assigned to the first list element in the
LHS list, i.e. $test - as if
$test = $test[0];
Note, in this case, the parens are optional on the RHS, as the same thing
would happen in
($test) = @test;
you can add to that LHS list
my ($test1, $test2, $test3, @test4) = @test;
and elements 0, 1, 2 go into the scalars and the rest is "slurped" into
@test4. If there not enough elements, they get "undef".
An array in scalar context returns it's element count, so you can do:
if ( @test == 4 ) {
print "There's 4 things in \@test!\n";
}
--
a
Andy Bach,
afb...@gmail.com
608 658-1890 cell
608 261-5738 wk
