2023 - Day 1

2023/01/solution.ts

@@ -0,0 +1,63 @@
+const sample = await Deno.readTextFile("sample.txt");
+const sample2 = await Deno.readTextFile("sample2.txt");
+const input = await Deno.readTextFile("input.txt");
+
+const wordsToNumbers: Record<string, number> = {
+  one: 1,
+  two: 2,
+  three: 3,
+  four: 4,
+  five: 5,
+  six: 6,
+  seven: 7,
+  eight: 8,
+  nine: 9,
+};
+
+const getNumberStringsFromString = (data: string): string[] =>
+  data.match(/(\d)/g) ?? [];
+
+const getNumberStringsAndNumberWordsFromString = (data: string): string[] =>
+  Array.from(
+    data.matchAll(
+      new RegExp(`(?=(\\d|${Object.keys(wordsToNumbers).join("|")}))`, "gi"),
+    ),
+    (x) => x[1],
+  );
+
+const replaceWordNumbersToNumbers = (data: string): string =>
+  data.replace(
+    new RegExp(Object.keys(wordsToNumbers).join("|"), "gi"),
+    (match) => String(wordsToNumbers[match]),
+  );
+
+const solvePart1 = (data: string): number =>
+  data
+    .split("\n")
+    .filter(Boolean)
+    .map(getNumberStringsFromString)
+    .map((numbers) => [
+      numbers[0],
+      numbers[numbers.length - 1],
+    ])
+    .map(([a, b]) => parseFloat(a + b))
+    .reduce((s, v) => s + v);
+
+console.log("Sample:", solvePart1(sample)); // 142
+console.log("Input", solvePart1(input)); // 55090
+
+const solvePart2 = (data: string): number =>
+  data
+    .split("\n")
+    .filter(Boolean)
+    .map(getNumberStringsAndNumberWordsFromString)
+    .map((numbers) => numbers.map(replaceWordNumbersToNumbers))
+    .map((numbers) => [
+      numbers[0],
+      numbers[numbers.length - 1],
+    ])
+    .map(([a, b]) => parseFloat(a + b))
+    .reduce((s, v) => s + v);
+
+console.log("Sample2:", solvePart2(sample2)); //281
+console.log("Input", solvePart2(input)); //54845