Empty list technique (was Re*: "foreach" is to "next" as "map" is to ???)

To help understand the empty list technique, look at this code, guess what it will output, and then try it.

my @a=((),(),());
printf "%d\n", scalar @a;
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List flattening is the key. A little more directly:

printf "%d\n", scalar map {()} 1..3;
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