Day 4

app/controllers/puzzles/4.js

@@ -4,13 +4,31 @@ import PuzzlesBaseController from './base';
 export default class Puzzles4Controller extends PuzzlesBaseController {
   // BEGIN-SNIPPET day4-solution1
   solve1(input) {
-    return 'Solution 1';
+    let solution = 0;
+    input.forEach(([winning, your]) => {
+      let intersec = your.filter((x) => winning.includes(x)).length;
+      if (intersec > 0) {
+        solution += Math.pow(2, intersec - 1);
+      }
+    });
+    return solution;
   }
   // END-SNIPPET
 
   // BEGIN-SNIPPET day4-solution2
   solve2(input) {
-    return 'Solution 1';
+    let total = [];
+    for (let i = input.length - 1; i >= 0; i--) {
+      let [winning, your] = input[i];
+      let intersec = your.filter((x) => winning.includes(x)).length;
+      if (intersec > 0) {
+        const value = total.slice(-intersec).reduce((a, b) => a + b);
+        total.push(value + 1);
+      } else {
+        total.push(1);
+      }
+    }
+    return total.reduce((a, b) => a + b);
   }
   // END-SNIPPET
 }

app/routes/puzzles/4.js

@@ -2,7 +2,12 @@ import Route from '@ember/routing/route';
 
 export default class Puzzles4Route extends Route {
   parseInput(file) {
-    return file.split('\n');
+    return file.split('\n').map((line) =>
+      line
+        .split(': ')[1]
+        .split([' | '])
+        .map((numbers) => numbers.match(/\d+/g)),
+    );
   }
 
   async model() {