Instance of example added to 6 lecture. Implementation of checkType is just for educational reasons. Real implementation of something like this would be other.

Author: peterszatmary

README.md

@@ -70,12 +70,14 @@ elephant => name = elephant 2, age = 10, vaccination = true
 => name = BMW => speed = 220 => price = 4500 => sport = undefined
  ```
 
-- **6. Inheritance, abstract class, toString example**.
+- **6. Inheritance, abstract class, toString, instanceof example**.
 
  **output** :
   ```shell
+It is Ferrari
 { name: 'My Ferrari', sport: true, toString: [Function] }
 Vehicle = [ name : My Ferrari , sport : true , speed : 250 , price : 5600]
+It is Ford
 { name: 'My Ford', sport: false, toString: [Function] }
 Vehicle = [ name : My Ford , sport : false , speed : 190 , price : 3000]
  ```

build/6-inheritance/main.js

@@ -1,3 +1,14 @@
+// instance of example
+function checkType(vehicle : Vehicle) {
+    if (vehicle instanceof Ford) {
+        return "It is Ford"
+    } else if (vehicle instanceof Ferrari) {
+        return "It is Ferrari"
+    } else {
+        return "It is unknown"
+    }
+}
+
 // example of abstract class
 abstract class Vehicle {
 
@@ -55,8 +66,10 @@ class Ford extends Vehicle {
 
 // executable
 let vehicle : Vehicle = new Ferrari()
+console.log(checkType(vehicle))
 console.log(vehicle)
 console.log(vehicle.toString())
 vehicle = new Ford()
+console.log(checkType(vehicle))
 console.log(vehicle)
 console.log(vehicle.toString())