The answers are:
- Just because.... ;-)
In a few cases, $_
is implicitely localized
in the block/expression of map
and in the block of a foreach
that doesn't have
its own iterator mentioned. (If the iterator is mentioned,
with no my
preceeding it, the iterator is
localized too). This is all documented where foreach
There is a difference between foreach and
while because they are two totally different
things. foreach always assigns
to a variable when looping over a list, while while
normally doesn't. It's just that while (<>)
is an exception and only when there's a single diamond
operator there's an implicite assignment to $_.
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