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Task/Langtons-ant/Sidef/langtons-ant.sidef

@@ -0,0 +1,24 @@
+define dirs = [[1,0], [0,-1], [-1,0], [0,1]]
+define size = 100
+
+enum |White, Black|
+var plane = size.of { size.of (White) }
+
+var (x, y) = @|([size/2 -> int]*2)
+var dir = dirs.len.irand
+
+var moves = 0
+loop {
+    (x >= 0) && (y >= 0) && (x < size) && (y < size) || break
+
+    given(plane[x][y]) {
+        when (White) { dir--; plane[x][y] = Black }
+        when (Black) { dir++; plane[x][y] = White }
+    }
+
+    ++moves
+    [\x, \y]:dirs[dir %= dirs.len] -> each {|a,b| *a += b }
+}
+
+say "Out of bounds after #{moves} moves at (#{x}, #{y})"
+plane.map{.map {|square| square == Black ? '#' : '.' }}.each{.join.say}