Learned about prototype methods, modify prototype, some methods and o…

…bject composition

03 - Chai aur Javascript/13 - Prototypes/04_prototype_methods_and_properties.js

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+// Prototype Methods and Properties
+
+function Car(brand, model){
+    this.brand = brand
+    this.model = model
+}
+
+// Create Prototype Method
+Car.prototype.start = function(){
+    console.log(`${this.brand} ${this.model} starts.`);
+}
+
+// Create Prototype Property
+Car.prototype.year = 2024
+
+
+// Object
+const myCar = new Car("Mahindra", "Scorpio-N")
+
+// Call method
+myCar.start() // Output: Mahindra Scorpio-N starts
+
+// Call property
+console.log(myCar.year) // Output : 2024

03 - Chai aur Javascript/13 - Prototypes/05_modifying_prototypes.js

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+// Modifying Prototypes
+
+function Vehicle(type){
+    this.type = type
+}
+
+// Prototype method
+Vehicle.prototype.describe = function(){
+    console.log(`This is a ${this.type}`);
+}
+
+// Object
+const bike = new Vehicle('bike')
+bike.describe() // This is a bike
+
+
+Vehicle.prototype.describe = function(){
+    console.log(`The type of the Vehicle is ${this.type}`);
+}
+
+bike.describe() // The type of the Vehicle is bike

03 - Chai aur Javascript/13 - Prototypes/06_setPrototypeOf.js

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+// setPrototypeOf
+
+const animal = {
+    speak(){
+        console.log("Animal Speaks.");
+    }
+}
+
+const dog = {
+    bark() {
+        console.log("Dog barks.");
+    }
+}
+
+Object.setPrototypeOf(dog, animal)
+
+dog.speak() // Output: Animal speaks (inherited from prototype)
+
+dog.bark() // Output: Dog barks
+
+animal.speak() // Output : Animal speaks
+
+animal.bark() // Error: animal.bark is not a function

03 - Chai aur Javascript/13 - Prototypes/07_getPrototypeOf.js

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+// Object.getPrototypeOf.js
+
+const animal = {
+    speak(){
+        console.log("Animal speaks");
+    }
+}
+
+const dog = Object.create(animal)
+
+console.log(Object.getPrototypeOf(dog)); // Output {speak : [Function speak]}

03 - Chai aur Javascript/13 - Prototypes/08_hasOwnProperty.js

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+// Object.hasOwnProperty()
+
+const animal = {
+    speak(){
+        console.log("Animal speaks");
+    }
+}
+
+const dog = Object.create(animal)
+
+
+dog.bark = function(){
+        console.log("Dog barks");
+}
+
+dog.bark()
+dog.speak()
+
+console.log(dog.hasOwnProperty('bark')); // true (own property)
+console.log(dog.hasOwnProperty('speak')); // false (inherited property)

03 - Chai aur Javascript/13 - Prototypes/09_object_composition.js

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+// Object Composition
+
+const vehicle = {
+    start(){
+        console.log("Vehicle started");
+    }
+}
+
+// Object.assign({}, vehicle, {drive(){}})
+// Pehla argument {} ek empty object hai, jis mein saari properties copy hogi.
+// Dusra argument vehicle hai, jisse start method copy hoga
+// Teesra argument ek naya object hai jisme drive method define kiya jaega.
+const car = Object.assign({}, vehicle, {
+    drive(){
+        console.log("Car is Driving");
+    }
+})
+
+car.start() // Output: Vehicle started
+car.drive() // Output: Car is driving