day 3 part 1

inputs/03.txt

@@ -0,0 +1,6 @@
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solutions/02.ts

@@ -68,7 +68,7 @@ class DayTwo implements Solvable {
             // accept one unsafe diff if all gradients either ascending or descending
             if (ascendingAmount === gradients.length || descendingAmount === gradients.length && unsafeDiffs === 1) return true
 
-            // allow for a single wrong gradient
+            // allow for one wrong gradient
             const ascendingExceptOne = ascendingAmount >= gradients.length - 1
             const descendingExceptOne = descendingAmount >= gradients.length - 1
             return ascendingExceptOne || descendingExceptOne

solutions/03.ts

@@ -0,0 +1,28 @@
+
+import { solvables } from "../main.ts";
+
+import type { Solvable } from "../solvable.ts";
+import { readInput } from "../utils.ts";
+
+class DayThree implements Solvable {
+    input = readInput('03')
+
+    public part1(): Solvable {
+        const re = /mul\([0-9]+,[0-9]+\)/g
+        // get all matches and parse them to int[]
+        const result = this.input.matchAll(new RegExp(re))
+            .map(match => match[0]
+                .slice(4, -1)
+                .split(',')
+                .map(arr => Number.parseInt(arr)))
+            .map(([left, right]) => left * right)
+            .reduce((prev, curr) => prev + curr)
+            console.log(result)
+            return this
+    }
+    public part2(): Solvable {
+      return this
+    }
+}
+
+solvables.push(new DayThree())