Initial Commit

2023/01/index.ts

@@ -0,0 +1,55 @@
+import { sumArray } from '../../utils/array.ts';
+
+export function solveFirst(input: string): number {
+  const regex = /^.*?(\d).*(\d).*?$|^.*(\d).*$/gm;
+  const match = input.matchAll(regex);
+
+  if (!match) {
+    return 0;
+  }
+
+  const numbers = Array.from(match, (m) =>
+    Number(m[3] ? `${m[3]}${m[3]}` : `${m[1]}${m[2]}`)
+  );
+  return numbers.reduce((sum, number) => sum + number, 0);
+}
+
+export function solveSecond(input: string): number {
+  const lookup: Record<string, string> = {
+    one: '1',
+    two: '2',
+    three: '3',
+    four: '4',
+    five: '5',
+    six: '6',
+    seven: '7',
+    eight: '8',
+    nine: '9',
+    '1': '1',
+    '2': '2',
+    '3': '3',
+    '4': '4',
+    '5': '5',
+    '6': '6',
+    '7': '7',
+    '8': '8',
+    '9': '9',
+    '0': '0'
+  } as const;
+
+  const regex =
+    /^.*?(one|two|three|four|five|six|seven|eight|nine|\d).*(one|two|three|four|five|six|seven|eight|nine|\d).*?$|^.*(one|two|three|four|five|six|seven|eight|nine|\d).*$/gm;
+  const match = input.matchAll(regex);
+
+  if (!match) {
+    return 0;
+  }
+
+  const numbers = Array.from(match, (m) =>
+    Number(
+      m[3] ? `${lookup[m[3]]}${lookup[m[3]]}` : `${lookup[m[1]]}${lookup[m[2]]}`
+    )
+  );
+
+  return sumArray(numbers);
+}