constructorFunctionExample.js

// Example Of Constructor Function
function User(firstName, lastName, age) {
  this.firstName = firstName
  this.lastName = lastName
  this.age = age

  this.getDetails = function () {
    console.log(`I am ${this.firstName} ${this.lastName}`)
  }
}

// Creating a new person with 'new' keyword 
const akash = new User('Akash', 'Rajvanshi', 22)
console.log(akash) // User { firstName: 'Akash', lastName: 'Rajvanshi', age: 22, getDetails: [λ] }
console.log(akash.getDetails()) // I am Akash Rajvanshi

// New User 
const abha = new User('Abha', 'Rajvanshi', 58)
console.log(abha) // User { firstName: 'Abha', lastNam: 'Rajvanshi', age: 58, getDetails: [λ] }
console.log(abha.getDetails()) // I am Abha Rajvanshi