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instructions = ARGF.read.lines(chomp: true)
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def exec(instructions)
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return enum_for(__method__, instructions) unless block_given?
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x = 1
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instructions.each do |instruction|
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case instruction
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when /noop/
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yield x
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when /addx (-?\d+)/
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yield x
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yield x
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x += $1.to_i
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else
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fail "invalid instruction: #{instruction}"
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end
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end
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yield x
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end
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x_hist = exec(instructions).to_a
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# part one
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p 20.step(by: 40, to: 220).sum { x_hist[_1-1] * _1 }
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# part two
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puts x_hist.each_slice(40).map {|row|
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row.each.with_index.map {|x, cycle|
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(-1..1).cover?(cycle - x) ? ?# : ?.
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}.join
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}.join("\n")
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# a functional version of part two, but I think
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# the imperative version feels closer to the domain
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#
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# x_hist.each_slice(40) do |row|
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# row.each.with_index do |x, cycle|
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# putc (-1..1).cover?(cycle - x) ? ?# : ?.
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# end
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# puts
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# end
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