diff --git a/index.js b/index.js
index e69de29bb2..7fcafc575a 100644
--- a/index.js
+++ b/index.js
@@ -0,0 +1,25 @@
+var recipes = {cake:"eggs", bread: "flour"}
+
+function updateObjectWithKeyAndValue(object, key, value) {
+  var newObject = Object.assign({}, object, {[key]: value})
+  return newObject
+}
+
+function destructivelyUpdateObjectWithKeyAndValue(object, key, value) {
+  object[key] = value
+  return object
+}
+
+function deleteFromObjectByKey(object, key) {
+  var newObject = Object.assign({}, object)
+  delete newObject[key]
+  return newObject
+  
+}
+
+function destructivelyDeleteFromObjectByKey(object, key) {
+  delete object[key]
+  return object
+}
+
+console.log(updateObjectWithKeyAndValue(recipes, 'soup', "water"))
\ No newline at end of file