Solutions for day six

06/code.js

@@ -0,0 +1,20 @@
+const fs = require('fs');
+const inputArray = fs.readFileSync('input.txt').toString().split(",").map(Number);
+
+function countFish(days) {
+  const fishPerDay = new Array(9).fill(0); // Array of number of fish at each day remaining
+  inputArray.forEach(f => (fishPerDay[f]++)); // Populate the array based on the input
+
+  for (let d = 0; d < days; d++){
+      const fish = fishPerDay.shift();  // The number of fish at zero
+      (fishPerDay.push(fish)) && (fishPerDay[6] += fish); // Put that many fish at eight and add this number to six
+  }
+
+  return fishPerDay.reduce((a, b) => a + b, 0); // add up all the fish
+}
+
+// Part One
+console.log(countFish(80));
+
+// Part Two
+console.log(countFish(256));

06/input.txt

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+4,5,3,2,3,3,2,4,2,1,2,4,5,2,2,2,4,1,1,1,5,1,1,2,5,2,1,1,4,4,5,5,1,2,1,1,5,3,5,2,4,3,2,4,5,3,2,1,4,1,3,1,2,4,1,1,4,1,4,2,5,1,4,3,5,2,4,5,4,2,2,5,1,1,2,4,1,4,4,1,1,3,1,2,3,2,5,5,1,1,5,2,4,2,2,4,1,1,1,4,2,2,3,1,2,4,5,4,5,4,2,3,1,4,1,3,1,2,3,3,2,4,3,3,3,1,4,2,3,4,2,1,5,4,2,4,4,3,2,1,5,3,1,4,1,1,5,4,2,4,2,2,4,4,4,1,4,2,4,1,1,3,5,1,5,5,1,3,2,2,3,5,3,1,1,4,4,1,3,3,3,5,1,1,2,5,5,5,2,4,1,5,1,2,1,1,1,4,3,1,5,2,3,1,3,1,4,1,3,5,4,5,1,3,4,2,1,5,1,3,4,5,5,2,1,2,1,1,1,4,3,1,4,2,3,1,3,5,1,4,5,3,1,3,3,2,2,1,5,5,4,3,2,1,5,1,3,1,3,5,1,1,2,1,1,1,5,2,1,1,3,2,1,5,5,5,1,1,5,1,4,1,5,4,2,4,5,2,4,3,2,5,4,1,1,2,4,3,2,1