optional chaining

roeib · web-flow · commit 7cbb2652aef6 · 2020-01-28T12:20:19.000+02:00
diff --git a/README.md b/README.md
@@ -390,3 +390,25 @@ console.log(age);
 // expected output: "0"
 ```
 
+#  Optional chaining
+```javascript
+
+const car = {}
+const carColor = car.name.color
+console.log(carColor);
+// error- "Uncaught TypeError: Cannot read property 'carColor' of undefined		
+
+//In JavaScript, you can first check if an object exists, and then try to get one of its properties, like this:
+const carColor = car && car.name && car.name.color;
+console.log(carColor);
+//undefined- no error
+
+
+//Now this new optional chaining operator will let us be even more fancy:
+
+const newCarColor = car?.name?.color;
+console.log(newCarColor) 
+//undefined- no error
+					
+//You can use this syntax today using @babel/plugin-proposal-optional-chaining
+```
