diff --git a/2022/01/main.js b/2022/01/main.js
new file mode 100644
index 0000000..453167a
--- /dev/null
+++ b/2022/01/main.js
@@ -0,0 +1,11 @@
+import { expect } from "vitest";
+
+export const spy = (x) => {
+  console.debug(x);
+  return x;
+};
+
+export function expectSolution(result) {
+  console.info(result);
+  return expect(result);
+}
diff --git a/2022/01/test.js b/2022/01/test.js
index a573612..7da2d97 100644
--- a/2022/01/test.js
+++ b/2022/01/test.js
@@ -1,16 +1,14 @@
 import * as R from "remeda";
 import { test, expect } from "vitest";
 import fs from "fs-extra";
+import path from 'path';
+import { expectSolution } from './main.js';
 
 const split = (splitter) => (text) => text.split(splitter);
 const sum = R.sumBy(R.identity);
-const spy = (x) => {
-  console.debug(x);
-  return x;
-};
 
 const input = R.pipe(
-  fs.readFileSync("input", "utf8"),
+  fs.readFileSync( path.join( path.dirname(import.meta.url), "input").replace('file:',''), "utf8"),
   split("\n\n"),
   R.map((x) =>
     split("\n")(x)
@@ -20,10 +18,6 @@ const input = R.pipe(
   R.map(sum)
 );
 
-function expectSolution(result) {
-  console.info(result);
-  return expect(result);
-}
 
 test("part 1", () => {
   const maxCalories = R.pipe(input, (calories) => Math.max(...calories));
diff --git a/2022/02/part1.js b/2022/02/part1.js
new file mode 100644
index 0000000..2d3eb9c
--- /dev/null
+++ b/2022/02/part1.js
@@ -0,0 +1,60 @@
+import * as R from "remeda";
+import fs from "fs-extra";
+import path from "path";
+
+export const sampleInput = `A Y
+B X
+C Z`;
+
+export const puzzleInput = fs.readFileSync(
+  path.join(path.dirname(import.meta.url), "input").replace("file:", ""),
+  "utf8"
+);
+
+const playMap = {
+  X: "A", // rock
+  Y: "B", // paper
+  Z: "C", // scissors
+};
+
+export const parseInput = R.createPipe(
+  (text) => text.split("\n"),
+  R.filter(R.identity), // remove last line
+  R.map((entry) => entry.split(" "))
+);
+
+export const movePositions = ["A", "B", "C"];
+
+const playScore = {
+  A: 1,
+  B: 2,
+  C: 3,
+};
+
+const draw = 3;
+const lost = 0;
+const win = 6;
+
+const outcome = (opponent, me) => {
+  if (opponent === me) return draw;
+  if (opponent === "A") {
+    return me === "C" ? lost : win;
+  }
+  if (opponent === "B") {
+    return me === "A" ? lost : win;
+  }
+  return me === "B" ? lost : win;
+};
+
+export const mapScores = ([opponent, me]) => [
+  outcome(opponent, me),
+  playScore[me],
+];
+
+export const solutionPart1 = R.createPipe(
+  parseInput,
+  R.map(([a, b]) => [a, playMap[b]]),
+  R.map(mapScores),
+  R.map(R.sumBy(R.identity)),
+  R.sumBy(R.identity)
+);
diff --git a/2022/02/part2.js b/2022/02/part2.js
new file mode 100644
index 0000000..c70ebe1
--- /dev/null
+++ b/2022/02/part2.js
@@ -0,0 +1,25 @@
+import * as R from "remeda";
+
+import { movePositions, mapScores, playMap, parseInput } from "./part1.js";
+
+function calculateMove(opponent, verdict) {
+  const incr = {
+    Y: 0,
+    X: 2,
+    Z: 1,
+  };
+
+  const index =
+    (movePositions.findIndex((x) => x === opponent) + incr[verdict]) %
+    movePositions.length;
+
+  return movePositions[index];
+}
+
+export const solutionPart2 = R.createPipe(
+  parseInput,
+  R.map(([a, b]) => [a, calculateMove(a, b)]),
+  R.map(mapScores),
+  R.map(R.sumBy(R.identity)),
+  R.sumBy(R.identity)
+);
diff --git a/2022/02/test.js b/2022/02/test.js
new file mode 100644
index 0000000..778928a
--- /dev/null
+++ b/2022/02/test.js
@@ -0,0 +1,41 @@
+import { test, expect, describe } from "vitest";
+
+import { expectSolution } from "../01/main.js";
+import {
+  parseInput,
+  sampleInput,
+  puzzleInput,
+  mapScores,
+  solutionPart1,
+} from "./part1.js";
+import { solutionPart2 } from "./part2.js";
+
+describe("part 1", () => {
+  test("input parsing", () => {
+    expect(parseInput(sampleInput)).toEqual([
+      ["A", "Y"],
+      ["B", "X"],
+      ["C", "Z"],
+    ]);
+  });
+
+  test("mapScore", () => {
+    expect(mapScores(["A", "B"])).toEqual([6, 2]);
+    expect(mapScores(["B", "A"])).toEqual([0, 1]);
+    expect(mapScores(["C", "C"])).toEqual([3, 3]);
+  });
+
+  test("part 1, sample", () => {
+    expect(solutionPart1(sampleInput)).toEqual(15);
+  });
+
+  test("solution", () => {
+    expectSolution(solutionPart1(puzzleInput)).toEqual(12458);
+  });
+});
+
+describe("part 2", () => {
+  test("part 2", () => {
+    expectSolution(solutionPart2(puzzleInput)).toEqual(12683);
+  });
+});
diff --git a/2022/03/part1.js b/2022/03/part1.js
new file mode 100644
index 0000000..7366b96
--- /dev/null
+++ b/2022/03/part1.js
@@ -0,0 +1,20 @@
+import * as R from "remeda";
+import fs from "fs-extra";
+import path from "path";
+
+export const readFile = (year, day, file) =>
+  fs.readFileSync(path.join(year, day, file), "utf8");
+
+export const sample = readFile("2022", "03", "sample");
+export const puzzleInput = readFile("2022", "03", "input");
+
+export const solutionPart1 = R.createPipe(
+  (text) => text.split("\n"),
+  R.filter(R.identity),
+  R.map((line) => line.split("")),
+  R.map((line) => [line, line.splice(line.length / 2)]),
+  R.map((line) => R.intersection(...line)),
+  R.map((line) => line[0].charCodeAt(0)),
+  R.map((code) => (code > 96 ? code - 96 : code - 38)),
+  R.sumBy(R.identity)
+);
diff --git a/2022/03/part2.js b/2022/03/part2.js
new file mode 100644
index 0000000..b40e97e
--- /dev/null
+++ b/2022/03/part2.js
@@ -0,0 +1,12 @@
+import * as R from "remeda";
+
+export const solutionPart2 = R.createPipe(
+  (text) => text.split("\n"),
+  R.filter(R.identity),
+  R.map((line) => line.split("")),
+  R.chunk(3),
+  R.map((group) => group.reduce((a, b) => R.intersection(a, b))),
+  R.map((line) => line[0].charCodeAt(0)),
+  R.map((code) => (code > 96 ? code - 96 : code - 38)),
+  R.sumBy(R.identity)
+);
diff --git a/2022/03/sample b/2022/03/sample
new file mode 100644
index 0000000..f17e726
--- /dev/null
+++ b/2022/03/sample
@@ -0,0 +1,6 @@
+vJrwpWtwJgWrhcsFMMfFFhFp
+jqHRNqRjqzjGDLGLrsFMfFZSrLrFZsSL
+PmmdzqPrVvPwwTWBwg
+wMqvLMZHhHMvwLHjbvcjnnSBnvTQFn
+ttgJtRGJQctTZtZT
+CrZsJsPPZsGzwwsLwLmpwMDw
diff --git a/2022/03/test.js b/2022/03/test.js
new file mode 100644
index 0000000..4f1e0f8
--- /dev/null
+++ b/2022/03/test.js
@@ -0,0 +1,25 @@
+import { test, expect, describe } from "vitest";
+
+import { solutionPart1, sample, puzzleInput } from "./part1.js";
+
+import { solutionPart2 } from "./part2.js";
+
+function expectSolution(result) {
+  console.info(result);
+  return expect(result);
+}
+
+describe("part 1", () => {
+  test("sample", () => {
+    expect(solutionPart1(sample)).toEqual(157);
+  });
+  test("solution", () => {
+    expectSolution(solutionPart1(puzzleInput)).toEqual(8515);
+  });
+});
+
+describe("part 2", () => {
+  test("solution", () => {
+    expectSolution(solutionPart2(puzzleInput)).toEqual(2434);
+  });
+});
diff --git a/2022/04/part1.js b/2022/04/part1.js
new file mode 100644
index 0000000..7a346cb
--- /dev/null
+++ b/2022/04/part1.js
@@ -0,0 +1,20 @@
+import * as R from "remeda";
+
+import { readFile } from "../03/part1.js";
+
+export const sample = readFile("2022", "04", "sample");
+export const puzzleInput = readFile("2022", "04", "input");
+
+const rangeLength = ([a, b]) => b - a + 1;
+
+const isContainedBy = ([a1, a2], [b1, b2]) => a1 >= b1 && a2 <= b2;
+
+export const solutionPart1 = R.createPipe(
+  (text) => text.split("\n"),
+  R.filter(R.identity),
+  R.map((line) =>
+    line.split(",").map((range) => range.split("-").map((x) => parseInt(x)))
+  ),
+  R.map(R.sortBy((x) => rangeLength(x))),
+  R.countBy(([a, b]) => isContainedBy(a, b))
+);
diff --git a/2022/04/part2.js b/2022/04/part2.js
new file mode 100644
index 0000000..744c09b
--- /dev/null
+++ b/2022/04/part2.js
@@ -0,0 +1,13 @@
+import * as R from "remeda";
+
+const overlapsWith = ([a1, a2], [b1, b2]) => a2 >= b1;
+
+export const solutionPart2 = R.createPipe(
+  (text) => text.split("\n"),
+  R.filter(R.identity),
+  R.map((line) =>
+    line.split(",").map((range) => range.split("-").map((x) => parseInt(x)))
+  ),
+  R.map(R.sortBy(([x]) => x)),
+  R.countBy(([a, b]) => overlapsWith(a, b))
+);
diff --git a/2022/04/sample b/2022/04/sample
new file mode 100644
index 0000000..9f9e9cf
--- /dev/null
+++ b/2022/04/sample
@@ -0,0 +1,6 @@
+2-4,6-8
+2-3,4-5
+5-7,7-9
+2-8,3-7
+6-6,4-6
+2-6,4-8
diff --git a/2022/04/test.js b/2022/04/test.js
new file mode 100644
index 0000000..a96bd6e
--- /dev/null
+++ b/2022/04/test.js
@@ -0,0 +1,23 @@
+import { test, describe } from "vitest";
+
+import { expectSolution } from "../01/main.js";
+import { solutionPart1, puzzleInput, sample } from "./part1.js";
+import { solutionPart2 } from "./part2.js";
+
+describe("part 1", () => {
+  test("sample", () => {
+    expectSolution(solutionPart1(sample)).toEqual(2);
+  });
+  test("solution", () => {
+    expectSolution(solutionPart1(puzzleInput)).toEqual(605);
+  });
+});
+
+describe("part 2", () => {
+  test("sample", () => {
+    expectSolution(solutionPart2(sample)).toEqual(4);
+  });
+  test("solution", () => {
+    expectSolution(solutionPart2(puzzleInput)).toEqual(914);
+  });
+});
diff --git a/2022/template/part1.js b/2022/template/part1.js
new file mode 100644
index 0000000..b509eb0
--- /dev/null
+++ b/2022/template/part1.js
@@ -0,0 +1 @@
+import * as R from "remeda";
diff --git a/2022/template/part2.js b/2022/template/part2.js
new file mode 100644
index 0000000..31477e8
--- /dev/null
+++ b/2022/template/part2.js
@@ -0,0 +1,2 @@
+import * as R from "remeda";
+
diff --git a/2022/template/test.js b/2022/template/test.js
new file mode 100644
index 0000000..9859a0e
--- /dev/null
+++ b/2022/template/test.js
@@ -0,0 +1,20 @@
+import { test, expect, describe } from "vitest";
+
+import { expectSolution } from "../01/main.js";
+import {
+  solutionPart1,
+    puzzleInput,
+} from "./part1.js";
+import { solutionPart2 } from "./part2.js";
+
+describe("part 1", () => {
+  test.todo("solution", () => {
+    expectSolution(solutionPart1(puzzleInput)).toEqual('TODO');
+  });
+});
+
+describe("part 2", () => {
+  test.todo("solution", () => {
+    expectSolution(solutionPart2(puzzleInput)).toEqual('TODO');
+  });
+});