The concatenation operator (.) operates on two scalars, so its operand expressions are evaluated in scalar context. In scalar context @list evaluates to the number of elements in @list.

An array name in a double-quoted string is not a Perl expression. It's not evaluated normally. Context cannot be determined from the surrounding code, cause it's not in Perl code. An array name in a double-quoted string is replaced with the result join($", @array), and $" defaults to a space.

Update: Minor tweak to wording for preciseness.
Update: Removed misleading quotes as per reply.

In reply to Re: scalar context confusion by ikegami
in thread scalar context confusion by perlplayer

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