.

2021/1.js

@@ -0,0 +1,3 @@
+function day1(input, part2) {
+    return input.split`\n`.num().count((e, i, a, k = a[i - (part2 ? 3 : 1)]) => k && e > k)
+}

2021/15.js

@@ -0,0 +1,15 @@
+function day15(input, part2) {
+    let g = Grid.fromStr(input).num()
+
+    if (part2) {
+        g = new Grid(g.width * 5, g.height * 5).mapMut((e, pt) => ((g.get(new Pt(pt.x % g.width, pt.y % g.height)) + (pt.x / g.width | 0) + (pt.y / g.height | 0) - 1) % 9) + 1)
+    }
+
+    g.graphify()
+
+    let start = g.get(new Pt(0, 0))
+    let end = g.get(new Pt(g.width - 1, g.height - 1))
+    start.dijkstraTo(end)
+
+    return end.searchData.dist
+}

2021/2.js

@@ -0,0 +1,15 @@
+function day2(input, part2) {
+    let x = 0
+    let y = 0
+    let a = 0
+
+    input.split`\n`.forEach((e) => {
+        if (!part2) {
+            eval(e.replace("forward", "x +=").replace("up", "y -=").replace("down", "y +="))
+        } else {
+            eval(e.replace(/forward (.+)/, "x += $1; y += a * $1").replace("up", "a -=").replace("down", "a +="))
+        }
+    })
+
+    return x * y
+}