Add part 2 2023

src/2023/day01/part2.ts

@@ -0,0 +1,24 @@
+const digitMap = {
+  one: 1,
+  two: 2,
+  three: 3,
+  four: 4,
+  five: 5,
+  six: 6,
+  seven: 7,
+  eight: 8,
+  nine: 9,
+} as const;
+
+const regex = /(?=(\d|one|two|three|four|five|six|seven|eight|nine))/g;
+
+export function part2(input: string) {
+  return input.split('\n').reduce((acc, line) => {
+    const matches = [...line.matchAll(regex)].map(d => d[1]);
+    const value = [matches[0], matches.at(-1)]
+      .map(d => digitMap[d as keyof typeof digitMap] || d)
+      .join('');
+
+    return acc + Number(value);
+  }, 0);
+}

src/2023/day01/test.spec.ts

@@ -1,5 +1,6 @@
-import {part1} from './part1';
 import input from './input.txt';
+import {part1} from './part1';
+import {part2} from './part2';
 
 describe('Advent of Code 2023 - Day 1', () => {
   describe('part 1', () => {
@@ -15,4 +16,21 @@ treb7uchet`;
       expect(part1(input)).toBe(54331);
     });
   });
+
+  describe('part 2', () => {
+    test('should output 281', () => {
+      const testInput = `two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen`;
+      expect(part2(testInput)).toBe(281);
+    });
+
+    test('should output correct from input', () => {
+      expect(part2(input)).toBe(54518);
+    });
+  });
 });