solution day 2

src/day_2.jl

@@ -0,0 +1,41 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+
+function sliding(in, w::Int64; step::Int = 1)
+  ((@view in[i:i+w-1]) for i in 1:step:length(in)-w+1)
+end
+
+
+function p1(input::Vector{String})
+  d = [0, 0]
+  for i ∈ input
+    c = match(r"(\w+)\s(\d+)", i).captures
+    if c[1] == "forward"
+      d[1] += parse(Int, c[2])
+    elseif c[1] == "down"
+      d[2] += parse(Int, c[2])
+    elseif c[1] == "up"
+      d[2] -= parse(Int, c[2])
+    end
+  end
+  prod(d)
+end
+
+
+function p2(input::Vector{String})
+  d = [0, 0, 0]
+  for i ∈ input
+    c = match(r"(\w+)\s(\d+)", i).captures
+    if c[1] == "forward"
+      d[1] += parse(Int, c[2])
+      d[2] += parse(Int, c[2]) * d[3]
+    elseif c[1] == "down"
+      d[3] += parse(Int, c[2])
+    elseif c[1] == "up"
+      d[3] -= parse(Int, c[2])
+    end
+  end
+  prod(d[1:2])
+end
+
+@aoc(2021, 2)