Perl 6 Parallelism in Perl 6 #25

Parallel list generators (hyper)

@results := map { .say; $_ * 2 }, @data;
# nothing output yet, map is lazy

@results := eager map { .say; $_ * 2 }, @data;
# eager evaluation forced
# each element of @data printed in sequence
@results = hyper map { .say; $_ * 2 }, @data;
# elements of @data printed in any order
# @results same order as @data
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