diff --git a/index.js b/index.js
index e69de29bb..8b4def432 100644
--- a/index.js
+++ b/index.js
@@ -0,0 +1,21 @@
+function updateObjectWithKeyAndValue(object, key, value) {
+  const newObj = Object.assign({}, object);
+  newObj[key] = value;
+  return newObj;
+}
+
+function destructivelyUpdateObjectWithKeyAndValue(object, key, value) {
+  object[key] = value;
+  return object;
+}
+
+function deleteFromObjectByKey(object, key) {
+  const newObj = Object.assign({}, object);
+  delete newObj[key];
+  return newObj;
+}
+
+function destructivelyDeleteFromObjectByKey(object, key) {
+  delete object[key];
+  return object;
+}