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In JavaScript, almost “everything” is an object. Understanding how to create and work with objects effectively is fundamental to becoming proficient in JavaScript development.
All the objects created inherits directly from the built-in Object.prototype by default.
There are several ways to create object in JavaScript. Here are some common methods:
1. Object Literals
Simple and Straightforward way to create a object without specifying a prototype explicitly.
const obj = { property1: "value1", property2: "value2" };
2. Using the new keyword with Object Constructor
We can create objects using the built-in Object constructor function along with the new keyword.
const obj = new Object(); obj.key1 = value1; obj.key2 = value2;
3. Object.create() Method
Unlike other object creating methods Object.create() allows us to explicitly specify the prototype of the newly created object.
const prototypeObject = {}; // Prototype object const obj = Object.create(prototypeObject);
Prototype chain of the new object will include the prototypeobject provided as an argument, and ultimately, it will inherit from Object.prototype.
4. Factory Functions
A simpler approach to create objects by encapsulating the object creation process within a function.
function myFunction(key1, key2) { return { key1: key1, key2: key2 }; } const obj = myFunction(value1, value2);
5. Using Function Constructors
We can define a constructor function and then create objects from it using the new keyword which is useful for creating multiple objects with the same structure.
Constructor functions typically start with a capital letter by convention.
function MyObject(key1, key2) { this.key1 = key1; this.key2 = key2; } const obj = new MyObject(value1, value2);
6. Using ES6 Classes
Introduced in ES6, class syntax allows us to define object blueprints more clearly.
Classes are primarily syntactical sugar over JavaScript’s existing prototype-based inheritance.
class MyClass { constructor(key1, key2) { this.key1 = key1; this.key2 = key2; } } const obj = new MyClass(value1, value2);
Quick Question: Is it possible to create an object with no prototype methods?
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