2021 - Day 1

2021/01/solution.ts

@@ -0,0 +1,43 @@
+const sample = await Deno.readTextFile("sample.txt");
+const input = await Deno.readTextFile("input.txt");
+
+const solvePart1 = (data: string): number | undefined =>
+  data
+    .split("\n")
+    .filter(Boolean)
+    .map(parseFloat)
+    .reduce(
+      ([count, lastValue], value, index) => [
+        count + (index > 0 && value > lastValue ? 1 : 0),
+        value,
+      ],
+      [0, 0]
+    )
+    .shift();
+
+console.log("Sample:", solvePart1(sample));
+console.log("Input", solvePart1(input));
+
+const solvePart2 = (data: string): number | undefined =>
+  data
+    .split("\n")
+    .filter(Boolean)
+    .map(parseFloat)
+    .reduce(
+      (windows, _, index, values) =>
+        index >= values.length - 2
+          ? windows
+          : [...windows, values[index] + values[index + 1] + values[index + 2]],
+      [] as number[]
+    )
+    .reduce(
+      ([count, lastValue], value, index) => [
+        count + (index > 0 && value > lastValue ? 1 : 0),
+        value,
+      ],
+      [0, 0]
+    )
+    .shift();
+
+console.log("Sample:", solvePart2(sample));
+console.log("Input", solvePart2(input));