How do I “flatten” a list of lists in perl 6?

Question

Let\'s say I want all permutations of 2 letters out of a, b and c.

I can do:

my @perm = .combinations(2)».permutations;
say @perm;
# [((         


        

Answer 1

my @perm = .combinations(2)».permutations;
dd [ @perm.map(*.Slip) ]
# OUTPUT«[("a", "b"), ("b", "a"), ("a", "c"), ("c", "a"), ("b", "c"), ("c", "b")]␤»

However, you may be better of to destructure the LoL when you use it later in the program. A map on a long list can take a jolly long time.