What's happening here is that when you do:
my @array = map { s/^-// } @ARGV;
two things are happening.
First, the subtitution is changing $_ which
is actually a reference to an element in @ARGV.
Like in foreach when you change $_ in a
map or grep it affects the item
in the array being based to map or grep.
As for the values in @array, they are always
1 in your example because the result of
s/^-// is 1 (true) when the substitution
succeeds, and false otherwise.
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