HTML - constructor function in JavaScript

A constructor function in JavaScript is a special type of function used to create and initialize objects. It acts like a blueprint for creating multiple instances of similar objects.

Key Features:

• Constructor functions start with a capital letter by convention (e.g., Person, Car).

• Used with the new keyword to create new object instances.

• this refers to the new object being created.

Basic Syntax:

function ConstructorName(parameters) {
  this.property1 = value1;
  this.property2 = value2;
  // ...
}

 Example: Person Constructor Function

function Person(name, age) {
  this.name = name;
  this.age = age;

  this.greet = function() {
    console.log("Hello, my name is " + this.name);
  };
}

// Creating instances
let person1 = new Person("Alice", 25);
let person2 = new Person("Bob", 30);

person1.greet(); // Hello, my name is Alice
person2.greet(); // Hello, my name is Bob

 Explanation:

• new Person("Alice", 25) does the following:

  1. Creates a new empty object.

  2. Sets this to point to that object.

  3. Assigns name and age to that object.

  4. Returns the object.

Why Use Constructor Functions?

• To avoid repeating code when creating many similar objects.

• To bundle related data and behavior together.