I feel this reads as quite elegant in Ruby -- or at least my implementation of it.
Hoping on something more interesting to do for Day 5!
require 'benchmark' class Passport RULES = { byr: -> (value) { /^[0-9]{4}$/.match?(value) && (1920..2002).cover?(value.to_i) }, iyr: -> (value) { /^[0-9]{4}$/.match?(value) && (2010..2020).cover?(value.to_i) }, eyr: -> (value) { /^[0-9]{4}$/.match?(value) && (2020..2030).cover?(value.to_i) }, hgt: -> (value) { match = /(^[1-9][0-9]+)(cm|in)$/.match(value) match && ( (match[2] == 'cm' && (150..193).cover?(match[1].to_i)) || (match[2] == 'in' && (59..76).cover?(match[1].to_i)) ) }, hcl: -> (value) { /^\#[0-9a-f]{6}$/.match? value }, ecl: -> (value) { %w[amb blu brn gry grn hzl oth].include?(value) }, pid: -> (value) { /^[0-9]{9}$/.match? value } } def self.from(lines) fields = lines.split(' ') new(fields.each_with_object({}) do |kv, results| k, v = kv.chomp.split(':') results[k.to_sym] = v end) end def initialize(fields) self.fields = fields end def [](field) fields[field] end def valid? RULES.keys.all? { |field| RULES[field].(self[field]) } end private attr_accessor :fields end data = File.read('input.txt') passports = data .split(/\n\n/) .map do |l| Passport.from(l) end Benchmark.bmbm do |b| b.report do puts passports.count(&:valid?) end end
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I feel this reads as quite elegant in Ruby -- or at least my implementation of it.
Hoping on something more interesting to do for Day 5!