Junctions

You can also build junctions from an array too.
There are other types of junction:
all & true for all elements
one ^ true for exactly one element
none true for no elements
my @bad_ext = ('vbs', 'js', 'exe', 'reg');
if lc($file_ext) eq any(@bad_ext) {
    say "$file_ext files not allowed";
}
Type :next to continue