2022 02

2022/02/part1.js

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+import * as R from "remeda";
+import { test, expect } from "vitest";
+import fs from "fs-extra";
+import path from 'path';
+
+import { spy } from '../01/main.js';
+
+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.map( entry => entry.split(' ') ),
+    R.map( ([a,b]) => [a,playMap[b]] ),
+)
+
+
+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.filter( ([a]) => a  ), // remove last line
+    R.map( mapScores ),
+    R.map( R.sumBy(R.identity) ),
+    R.sumBy(R.identity)
+);
+

2022/02/test.js

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+import { test, expect } from "vitest";
+
+import { expectSolution } from '../01/main.js';
+import { parseInput, sampleInput, puzzleInput, mapScores, solutionPart1 } from './part1.js';
+
+test( "input parsing", () => {
+    expect(parseInput(sampleInput)).toEqual([['A','B'],['B','A'],['C','C']]);
+});
+
+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("part 1", () => {
+  expectSolution(solutionPart1(puzzleInput)).toEqual(12458);
+});
+
+test.todo("part 2", () => {
+});