Done

index.js

@@ -0,0 +1,22 @@
+var recipes = {}
+
+function updateObjectWithKeyAndValue(object, key, value){
+  return Object.assign({}, object, {[key]: value})
+}
+
+function destructivelyUpdateObjectWithKeyAndValue(object, key, value){
+  object[key] = value
+  return object
+}
+
+function deleteFromObjectByKey(object, key){
+  var newObj = Object.assign({}, object);
+  newObj
+  delete newObj[key];
+  return newObj;
+}
+
+function destructivelyDeleteFromObjectByKey(object, key){
+  delete object[key];
+  return object;
+}