advent-of-code

commit 4c9bdcf38343377bccb21899cc5460fea5c37b34
parent acd93d720bf1b0d151fdbcee5e3a51db53e1680f
Author: finwo <finwo@pm.me>
Date:   Wed,  8 Dec 2021 17:22:41 +0100

Finished puzzle 2 of day-00

Diffstat:
A
src/day-01/puzzle-02.ts
 | 
58
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

1 file changed, 58 insertions(+), 0 deletions(-)
diff --git a/src/day-01/puzzle-02.ts b/src/day-01/puzzle-02.ts
@@ -0,0 +1,58 @@
+import readline      from 'readline';
+import fs            from 'fs';
+import events        from 'events';
+
+let history        = [];
+let sumLast        = null;
+let increasedTotal = 0;
+
+let texts = [
+  'decreased',
+  'no change',
+  'increased',
+];
+
+function sum(...n) {
+  return n.reduce((r,a)=>r+a, 0);
+}
+
+(async () => {
+
+  const rl = readline.createInterface({
+    input  : fs.createReadStream(__dirname + '/input-01'),
+    output : null,
+  });
+
+  rl.on('line', line => {
+    if ((!line) || isNaN(line)) return;
+    const depth = parseInt(line);
+    history.push(depth);
+
+    while (history.length >= 3) {
+      const sumCurrent = sum(...history.slice(0,3));
+      history.shift();
+
+      if (null === sumLast) {
+        process.stdout.write(`${sumCurrent} (N/A - no previous measurement)\n`);
+      } else {
+        const increased = (sumCurrent > sumLast) | 0;
+        const decreased = (sumCurrent < sumLast) | 0;
+        increasedTotal += increased;
+        process.stdout.write(`${sumCurrent} (${texts[1 + increased - decreased]})\n`);
+      }
+
+      sumLast = sumCurrent;
+    }
+
+  });
+
+  await events.once(rl, 'close');
+
+  process.stdout.write('\n\n');
+  process.stdout.write('---[ REPORT ]---\n');
+  process.stdout.write(`Increased ${increasedTotal} times\n`);
+  process.stdout.write('\n');
+
+
+})();
+