bindMethod.js

function Person(firstName, lastName) {
  this.first_name = firstName
  this.last_name = lastName

  this.showDetails = function () {
    console.log(`Name: ${this.first_name} ${this.last_name}`) // Name: Akash Rajvanshi
  }
}

const person = new Person('Akash', 'Rajvanshi')
person.showDetails.bind(person)() // This is immediately invoked
const showDetailsOfPerson = person.showDetails.bind(person) // We can invoke this function later
showDetailsOfPerson()