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Dive into the foundational concept of JavaScript Inheritance with this thoughtful and comprehensive exploration. Gain a robust understanding, from definitions to practical application, of how this pivotal element shapes object-oriented programming. This resource provides detailed insights into Javascript Prototype Inheritance and its application in coding ventures, along with useful strategies for navigating and implementing Javascript Multiple Inheritance. Whether you're a budding coder or an experienced developer, this exploration will illuminate the critical role of Javascript Inheritance in Web Development. Discover how this core feature drives complex projects and enables dynamic, interactive web experiences.
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Jetzt kostenlos anmeldenDive into the foundational concept of JavaScript Inheritance with this thoughtful and comprehensive exploration. Gain a robust understanding, from definitions to practical application, of how this pivotal element shapes object-oriented programming. This resource provides detailed insights into Javascript Prototype Inheritance and its application in coding ventures, along with useful strategies for navigating and implementing Javascript Multiple Inheritance. Whether you're a budding coder or an experienced developer, this exploration will illuminate the critical role of Javascript Inheritance in Web Development. Discover how this core feature drives complex projects and enables dynamic, interactive web experiences.
Inheritance in JavaScript allows you to create objects which inherit properties from other 'parent' objects, thus reducing duplicacy and making your code more efficient.
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let parent = {
name: 'Parent',
age: 50,
greet: function() {
console.log('Hello');
}
};
let child = Object.create(parent);
In the code snippet above, the child object inherits properties and methods from the parent object.
The principle of Object-oriented Programming is to create, manipulate, and interact with objects within a system.
Given the prototype-based nature of JavaScript, Inheritance enables objects to inherit properties and functionalities from other objects, reducing code redundancy and improving program efficiency.
Prototype Inheritance, unique to JavaScript, involves objects inheriting directly from other objects.
Suppose there is a 'Vehicle' function that holds properties such as speed, mileage etc. If you now want to create a 'Car' function that shares the same properties but also has additional properties, you could use Prototype Inheritance. The 'Car' function would then inherit the properties of the 'Vehicle' function, and you can go ahead and add more properties to 'Car'. This is a simple yet powerful way to re-use code, reduce redundancy and enhance code readability.
function Vehicle(speed, mileage) {
this.speed = speed;
this.mileage = mileage;
}
function Car(color) {
this.color = color;
}
Car.prototype = new Vehicle(100, 10);
In the example of code above, the Car function is using the prototype property to inherit the properties of the Vehicle object.
function Vehicle(type, speed) {
this.type = type;
this.speed = speed;
}
Vehicle.prototype.describe = function() {
return "This " + this.type + " moves at " + this.speed + " mph.";
}
A 'Car' and 'Plane' can be considered as specific variants of a 'Vehicle'. Both 'Car' and 'Plane' share certain properties with 'Vehicle' but have their own distinct properties too. Through Functional Inheritance, you can establish this relationship.
function Car(type, speed, color) {
Vehicle.call(this, type, speed);
this.color = color;
}
function Plane(type, speed, altitude) {
Vehicle.call(this, type, speed);
this.altitude = altitude;
}
As evident from the above code snippet, the Car and Plane objects inherit the properties of the Vehicle object using the `Vehicle.call(this, type, speed);` feature of Functional Inheritance.
class Parent {
constructor(name, age) {
this.name = name;
this.age = age;
}
}
class Child extends Parent {
constructor(name, age, grade) {
super(name, age);
this.grade = grade;
}
}
In this scenario, the 'Child' class extends the 'Parent' class, thereby including the all properties of the 'Parent' in addition to its own. This is Object-Oriented Inheritance in action.
Multiple Inheritance refers to a feature of some object-oriented Programming Languages in which a class or an object can inherit characteristics and features from more than one parent class or object.
function SuperHero(name, power){
this.name = name;
this.power = power;
}
function Flying(powerOfFlight){
SuperHero.call(this, 'Flying Hero', 'Fly');
this.powerOfFlight = powerOfFlight;
}
Flying.prototype = new SuperHero();
In this example, you might consider the Flying SuperHero a product of multiple inheritance. But in reality, this is just Function Borrowing or Copying.
The SuperHero properties are borrowed or copied to the Flying function, but this is not multiple inheritance because Flying does not have a direct link or prototype chain to the SuperHero's prototype object.
However, multiple inheritance in JavaScript can be achieved through indirect ways, like using mixin or the copying methods.
The Diamond problem is an ambiguity that arises when a class inherits from two classes, and those two classes, in turn, inherit from a common superclass. This often leads to ambiguity in method resolution.
A Mixin is a class which contains methods that can be used by other classes without the need for inheritance.
let flyMixin = function(obj) {
obj.fly = function() {
console.log("Flying!");
}
};
let bird = {
name: "Sparrow",
speed: "10 m/s"
}
flyMixin(bird);
bird.fly();
A key advantage of mixins lies in the modular nature in which the functions are written, leading to organised and manageable code structure.
function Dog(name, breed) {
this.name = name;
this.breed = breed;
}
function Cat(name, color) {
this.name = name;
this.color = color;
}
function CatDog(name, breed, color) {
Dog.call(this, name, breed);
Cat.call(this, name, color);
}
Here, the CatDog function is created by copying properties from both the Dog and Cat function using the `call()` method.
While this might sound like a dream come true, it segues into the issue of property collision if the parent classes have a property of the same name. As such, leveraging this strategy demands careful design considerations.
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SIGNUP SIGNUPFlashcards in Javascript Inheritance12
Start learningWhat is Javascript Inheritance?
Javascript Inheritance allows creation of objects that inherit properties from 'parent' objects, making code more efficient and reducing duplicacy. Rather than classes, JavaScript uses prototypes for inheritance, chiefly achieved via the prototype chain.
How does Javascript handle properties in Inheritance?
When you try to access a specific property of an object, Javascript first checks if it's defined on the current object. If not, it checks the current object's prototype.
What is the role of Javascript Inheritance in Object-oriented programming?
Javascript Inheritance is invaluable in Object-oriented programming as it enables objects to inherit properties and functionalities from others, reducing code redundancy and improving program efficiency.
What is Javascript Prototype Inheritance?
Javascript Prototype Inheritance involves objects inheriting directly from other objects. Every Javascript object has an internal property referred to as [[Prototype]] and are linked to a 'prototype' object.
What is Functional Inheritance in JavaScript?
Functional Inheritance in JavaScript is when specific objects like 'Car' or 'Plane' inherit properties from a generic object like 'Vehicle' using commands such as `Vehicle.call(this, type, speed);`.
What should you remember while working with Functional Inheritance in JavaScript?
Always use the 'new' keyword to create objects, be careful when setting an object's prototype, use 'instanceof' to check if an object is an instance of a constructor, and remember that methods set via 'prototype' are shared amongst all instances of an object.
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