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ππ»Here's a breakdown of what's happening:
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1οΈβ£We have a Calculator class with methods for performing arithmetic operations.
2οΈβ£ Each method modifies the value property of the calculator object and returns the object itself (this) to allow for method chaining.
3οΈβ£In the usage section, we create an instance of the Calculator class and chain multiple method calls (add, multiply, subtract, and divide) one after another.
4οΈβ£The result is computed by evaluating the value property at the end of the chain.
π―By utilizing method chaining, we can perform multiple operations on the same object in a more concise and readable manner, avoiding the need for intermediate variables and separate statements.
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πMethod chaining can be a powerful technique when designing fluent interfaces or when performing a series of related operations on an object. It promotes code readability and can lead to more expressive and concise code.
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2 years ago | [YT] | 3
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codewithart
ππ»Here's a breakdown of what's happening:
1οΈβ£ We have a parent object called Engine that has a start method.
2οΈβ£Then, we create a child object called Car that composes the Engine object as one of its properties. By delegating the start method to the Engine object, the Car object can use the engine's functionality.
3οΈβ£When myCar.drive() is called, it invokes the drive method, which in turn calls the start method of the Engine object. This demonstrates how composition allows us to reuse the functionality of the Engine object within the Car object, promoting code reuse and modularity.
πComposition is a key concept in OOP that encourages building systems through the combination of smaller, self-contained objects. It provides a flexible alternative to class inheritance and allows for greater code organization, reuse, and maintainability.
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2 years ago | [YT] | 2
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codewithart
ππ»Here's a breakdown of what's happening:
1οΈβ£ We define an interface called `AnimalInterface` using a JavaScript object. It specifies that any class implementing this interface must have a method called `makeSound`. If the method is not implemented, an error will be thrown.
2οΈβ£We create two classes, `Dog` and `Cat`, that implement the `AnimalInterface`. Both classes define the `makeSound` method with different behaviors for each animal. The `Dog` class makes the sound "Woof!" and the `Cat` class makes the sound "Meow!".
3οΈβ£In the usage section, we create instances of `Dog` and `Cat` using the `new` keyword. The `dog` and `cat` objects are created based on their respective classes.
4οΈβ£We then invoke the `makeSound` method on both objects. Since both objects adhere to the `AnimalInterface`, we can treat them uniformly and call the `makeSound` method on each object.
5οΈβ£When `dog.makeSound()` is called, the output will be "Woof!", indicating that the dog is making a barking sound.
6οΈβ£When `cat.makeSound()` is called, the output will be "Meow!", indicating that the cat is making a meowing sound.
π―By using the interface, we ensure that both the `Dog` and `Cat` classes have implemented the required method, enabling polymorphism.
πDespite the different implementations of the `makeSound` method in each class, we can treat them uniformly and call the method on objects of different types, achieving polymorphic behavior.
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1οΈβ£ We define an interface called `AnimalInterface` using a JavaScript object. It specifies that any class implementing this interface must have a method called `makeSound`. If the method is not implemented, an error will be thrown.
2οΈβ£We create two classes, `Dog` and `Cat`, that implement the `AnimalInterface`. Both classes define the `makeSound` method with different behaviors for each animal. The `Dog` class makes the sound "Woof!" and the `Cat` class makes the sound "Meow!".
3οΈβ£In the usage section, we create instances of `Dog` and `Cat` using the `new` keyword. The `dog` and `cat` objects are created based on their respective classes.
4οΈβ£We then invoke the `makeSound` method on both objects. Since both objects adhere to the `AnimalInterface`, we can treat them uniformly and call the `makeSound` method on each object.
5οΈβ£When `dog.makeSound()` is called, the output will be "Woof!", indicating that the dog is making a barking sound.
6οΈβ£When `cat.makeSound()` is called, the output will be "Meow!", indicating that the cat is making a meowing sound.
π―By using the interface, we ensure that both the `Dog` and `Cat` classes have implemented the required method, enabling polymorphism.
πDespite the different implementations of the `makeSound` method in each class, we can treat them uniformly and call the method on objects of different types, achieving polymorphic behavior.
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2 years ago | [YT] | 2
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codewithart
π―In this example, we create instances of Circle and Rectangle and store them in an array. By iterating over the array and invoking the calculateArea method on each object, we demonstrate polymorphism.
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π»Explanation:
β We define a base class Shape with a calculateArea method that throws an error, indicating that it must be implemented in subclasses.
β The Circle and Rectangle classes inherit from Shape and provide their own implementation of calculateArea.
β The calculateArea method is polymorphic, as it can be invoked on objects of different types (Circle and Rectangle) but exhibits different behavior based on the specific object.
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πPolymorphism is a core concept in OOP that allows objects of different types to be treated as instances of a common superclass. It enables code flexibility, extensibility, and simplifies object interactions.
In JavaScript, polymorphism can be achieved through method overriding and interfaces.
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2 years ago | [YT] | 2
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codewithart
π»Explanation:
β We define a Counter constructor function that encapsulates a private variable called count and provides public methods to interact with it:
β increment: This method increases the value of count by 1.
β decrement: This method decreases the value of count by 1, but only if count is greater than 0.
β getCount: This method retrieves the current value of count.
πBy creating a new instance of the Counter object and using its methods, we can increment, decrement, and retrieve the count value. The count variable remains hidden and inaccessible from outside the Counter instance, ensuring encapsulation and data hiding.
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2 years ago (edited) | [YT] | 3
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codewithart
π»Explanation:
β We define a Shape constructor function that accepts a color parameter and sets the color property on the created object.
β The Shape prototype is augmented with a getColor method, which returns the color of the shape.
β Next, we define a Circle constructor function that extends the Shape constructor using Shape.call(this, color).
β We use Object.create(Shape.prototype) to create a new object that inherits from the Shape prototype and assign it to the Circle.prototype.
β We set the constructor property of Circle.prototype to Circle to correct the constructor reference.
β The Circle prototype is then augmented with a getArea method that calculates the area of the circle.
π―Finally, we create a circle object using the Circle constructor and demonstrate the inheritance of properties and methods from the Shape prototype.
πPrototypal inheritance is a powerful feature of JavaScript that allows you to achieve code reusability and extensibility within an object-oriented programming paradigm.
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2 years ago | [YT] | 2
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codewithart
πΉ Explanation:
1οΈβ£We define a module file called math.js that exports two functions, add and subtract, using the export keyword.
2οΈβ£In the main file app.js, we import the add and subtract functions from the math.js module using the import statement.
3οΈβ£We can then use the imported functions as regular functions in the app.js file.
πBy utilizing modules, you can organize your code into logical units, encapsulate functionality, and manage dependencies more effectively. Modular development promotes code reusability, maintainability, and collaboration among developers. With the introduction of ES Modules, JavaScript has embraced a standardized module system that is widely supported in modern browsers and Node.js environments.
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2 years ago | [YT] | 3
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codewithart
π Explanation:
β We define a constructor function called Person that accepts a name parameter and assigns it to the this.name property of the object being created.
β We add a greet method to the Person prototype using the Person.prototype object. This method can be shared among all instances of the Person object.
β We create a new instance of the Person object called person using the new keyword and passing the name 'John' to the Person constructor.
β Finally, we call the greet method on the person object, which outputs a greeting message with the person's name.
πBy understanding prototypes and prototypal inheritance, you can leverage the power of inheritance in JavaScript, create custom objects with shared functionality, and extend the behavior of existing objects.
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2 years ago | [YT] | 2
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codewithart
π©βπ» πExplanation:
β We define two mixin objects, canEat and canSleep, which contain respective methods for eating and sleeping.
β We create a new object called animal using Object.assign() to combine or compose the behavior of the canEat and canSleep mixins.
β The animal object now has access to the eat and sleep methods from the mixins, allowing us to call those methods on the animal object.
πBy leveraging object composition, you can create code that is more maintainable, reusable, and easier to understand. Understanding these concepts expands your options for structuring your JavaScript code and promotes the creation of highly adaptable and scalable applications
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2 years ago | [YT] | 3
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codewithart
π π©βπ» πExplanation:
β We define a Person class using the ES6 class syntax, which has a constructor method and a greet method.
β The constructor method is called when a new object is created from the class and initializes the name and age properties.
β The greet method is a function that logs a greeting message using the name and age properties of the object.
β We create two objects, person1 and person2, using the new keyword and pass the necessary arguments to the Person constructor.
π―Finally, we call the greet method on each object, which outputs a greeting message with the respective name and age.
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π By understanding and implementing OOP principles in JavaScript, you can create reusable and maintainable code, improve code organization, and build more complex and scalable web applications.
π―OOP is a fundamental concept in JavaScript and lays the foundation for learning advanced JavaScript frameworks and libraries.
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2 years ago | [YT] | 3
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