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### Re^4: What's happening in this expression?

by zapdos (Sexton)
 on Oct 11, 2020 at 14:02 UTC Need Help??

in reply to Re^3: What's happening in this expression?
in thread What's happening in this expression?

Please, why the statement my \$a, \$x, \$y, \$z = foo() is in void context? I don't get it.

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Re^5: What's happening in this expression?
by haukex (Archbishop) on Oct 11, 2020 at 14:26 UTC
Please, why the statement my \$a, \$x, \$y, \$z = foo() is in void context? I don't get it.

If you are unsure about Perl's concept of context, see e.g. the Context tutorial, the section "Context" in Chapter 2 of the Camel, or the section "Context" in Modern Perl.

In the example I showed, perl -e 'my \$a, \$x, \$y, \$z = foo()', the statement is in void context because it is the only statement in the program and its return value is not being used anywhere.

In my @foo = ( my \$a, \$x, \$y, \$z = foo() ); the statement is in list context because it is being assigned to an array, and in my \$bar = ( my \$a, \$x, \$y, \$z = foo() ); it's in scalar context. For the last statement in a sub, the context of the caller is used, which is why in the above example, my @x = bar(); the statement my \$a, \$x, \$y, \$z = foo(); is in list context and in my \$r = bar(); it's in scalar context. If you were to write my \$a, \$x, \$y, \$z = foo(); 1;, that would also force void context on the statement.

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