diff --git a/index.js b/index.js
index 132693a35c..55ecc8fa3c 100644
--- a/index.js
+++ b/index.js
@@ -1 +1,33 @@
-// Write your solution here!
+const cats = ["Milo", "Otis", "Garfield"]
+
+const destructivelyAppendCat = (catToAppend) => {
+    cats.push(catToAppend)
+}
+
+const destructivelyPrependCat = (catToPrepend) => {
+    cats.unshift(catToPrepend)
+}
+
+const destructivelyRemoveLastCat = () => {
+    cats.pop();
+}
+
+const destructivelyRemoveFirstCat = () => {
+    cats.shift();
+}
+
+const appendCat = (catToAppend) => {
+    return [...cats, catToAppend]
+}
+
+const prependCat = (catToPrepend) => {
+    return [catToPrepend, ...cats]
+}
+
+const removeLastCat = () => {
+    return cats.slice(0, -1)
+}
+
+const removeFirstCat = () => {
+    return cats.slice(1)
+}
\ No newline at end of file
diff --git a/package.json b/package.json
index 1e0dc2b37d..d9efe32615 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "description": "JavaScript Data Structures Arrays Lab for Learn.co",
   "main": "index.js",
   "scripts": {
-    "test": "mocha --timeout 5000 -R mocha-multi --reporter-options spec=-,json=.results.json"
+    "test": "mocha --timeout 5000 --bail -R  mocha-multi --reporter-options spec=-,json=.results.json"
   },
   "repository": {
     "type": "git",