part 2

2022/10/part1.js

@@ -20,17 +20,16 @@ export const comsys = () => {
   const scheduled = [];
 
   return (instr) => {
-        if( instr && (instr[0] === 'addx') ) {
+    if (instr && instr[0] === "addx") {
       scheduled.push(0, instr[1]);
-        } else {
+    } else if (instr) {
       scheduled.push(0);
     }
     cycle++;
     register += scheduled.shift() ?? 0;
     return { cycle, register };
-    }
+  };
-
+};
-}
 
 export const gatherStrength = () => {
   let strength = 0;
@@ -39,25 +38,25 @@ export const gatherStrength = () => {
       strength += signal;
     }
     return { strength, cycle, signal, register };
-    }
+  };
-}
+};
 
 export const addSignal = (input) => ({
   ...input,
-    signal: input.cycle*input.register
+  signal: input.cycle * input.register,
 });
 
-
 export default (instructions) => {
   const sys = comsys();
 
+  instructions = [...instructions];
+
   return R.pipe(
     R.range(0, 220),
     R.map(() => sys(instructions.shift())),
     R.map(addSignal),
     R.map(gatherStrength()),
     R.last,
-        R.prop('strength')
+    R.prop("strength")
-    )
+  );
-
 };

2022/10/part2.js

@@ -1,13 +1,35 @@
 import * as R from "remeda";
-import { comsys  } from './part1.js';
 
+export const comsys = () => {
+  let cycle = 0;
+  let register = 1;
+  const scheduled = [];
+
+  return (instr) => {
+    if (instr && instr[0] === "addx") {
+      scheduled.push(0, instr[1]);
+    } else if (instr) {
+      scheduled.push(0);
+    }
+    cycle++;
+    register += scheduled.shift() ?? 0;
+    return { cycle, register };
+  };
+};
+
+const toPixel = (entry, i) => {
+  if (entry.register >= i - 1 && entry.register <= i + 1) return "#";
+  else return ".";
+};
 
 export default (instructions) => {
   const sys = comsys();
 
+  instructions = [...instructions];
   return R.pipe(
-        R.range(0,3),
+    [sys(), ...R.range(0, 239).map(() => sys(instructions.shift()))],
-        R.map( () => sys(instructions.shift()) ),
+    R.chunk(40),
-    )
+    R.map((line) => line.map(toPixel).join("") + "\n"),
-
+    (lines) => lines.join("")
+  );
 };

2022/10/test.js

@@ -2,41 +2,55 @@ import { test, expect, describe } from "vitest";
 import * as R from "remeda";
 
 import { expectSolution } from "../01/main.js";
-import part1, { comsys, sample, sample2, puzzleInput, addSignal } from "./part1.js";
+import part1, {
+  comsys,
+  sample,
+  sample2,
+  puzzleInput,
+  addSignal,
+} from "./part1.js";
 import part2 from "./part2.js";
 
 describe("part 1", () => {
   test("comsys", () => {
     let sys = comsys();
-        const result = sample.map( sys).map(R.prop('register'));
+    const result = sample.map(sys).map(R.prop("register"));
 
     expect(result).toEqual([1, 1, 4]);
 
     sys = comsys();
-        expect(sample.map(  sys ).map(R.prop('cycle'))
+    expect(sample.map(sys).map(R.prop("cycle"))).toEqual([2, 3, 4]);
-
-        ).toEqual([2,3,4] )
-
   });
   test("signal strength", () => {
     expect(addSignal({ cycle: 3, register: 2 })).toMatchObject({ signal: 6 });
-
   });
   test("sample2", () => {
-
     expect(part1(sample2)).toEqual(13140);
-
   });
   test("solution", () => {
     expectSolution(part1(puzzleInput)).toEqual(15020);
   });
 });
 
-describe.only("part 2", () => {
+describe("part 2", () => {
   test("sample", () => {
-    expectSolution(part2(sample2)).toEqual("TODO");
+    expect(part2(sample2)).toEqual(`##..##..##..##..##..##..##..##..##..##..
+###...###...###...###...###...###...###.
+####....####....####....####....####....
+#####.....#####.....#####.....#####.....
+######......######......######......####
+#######.......#######.......#######.....
+`);
   });
-  test.todo("solution", () => {
+  test("solution", () => {
-    expectSolution(part2(puzzleInput)).toEqual("TODO");
+    expectSolution(part2(puzzleInput)).toEqual(
+      `####.####.#..#..##..#....###...##..###..
+#....#....#..#.#..#.#....#..#.#..#.#..#.
+###..###..#..#.#....#....#..#.#..#.#..#.
+#....#....#..#.#.##.#....###..####.###..
+#....#....#..#.#..#.#....#....#..#.#....
+####.#.....##...###.####.#....#..#.#....
+`
+    );
   });
 });