Discussion on: Advent of Code 2020 Solution Megathread - Day 1: Report Repair

[Michael Kohl]

I never manage to find the time for more than a handful of solutions (point in case, I just did day 1 and 2 yesterday), but I like doing them in languages I don't know well. This year I picked Raku, formerly known as Perl 6.

my @l = 'aoc-expenses.txt'.IO.lines;

# part 1
say [*] @l.combinations(2).first: *.sum == 2020;

# part 2
say [*] @l.combinations(3).first: *.sum == 2020;

Notable features:

• The reduction metaoperator [ ] with the * operation for getting the final product.
• The combinations method of the list class.