Day 04 in javascript

This is a lot of copy/paste, but I am on a time crunch this morning so I'll clean it up later!

.vscode/launch.json

@@ -4,10 +4,19 @@
     // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
     "version": "0.2.0",
     "configurations": [
+        {
+            "name": "Node run 04",
+            "program": "${workspaceFolder}/src/04.js",
+            "request": "launch",
+            "skipFiles": [
+                "<node_internals>/**"
+            ],
+            "type": "pwa-node"
+        },
         {
             "type": "lldb",
             "request": "launch",
-            "name": "Debug executable 'aoc2021'",
+            "name": "Debug Rust executable 'aoc2021'",
             "cargo": {
                 "args": [
                     "build",
@@ -25,7 +34,7 @@
         {
             "type": "lldb",
             "request": "launch",
-            "name": "Debug unit tests in executable 'aoc2021'",
+            "name": "Debug Rust unit tests in executable 'aoc2021'",
             "cargo": {
                 "args": [
                     "test",