hardBindingMethod.js

function showDetails() {
  console.log(this) // { firstName: 'Akash', lastName: 'Rajvanshi' } X 3
  console.log(this.firstName, this.lastName) // Akash Rajvanshi x 3
}

var fullName = {
  firstName: 'Akash',
  lastName: 'Rajvanshi'
}

var exampleOfHardBinding = function () {
  showDetails.call(fullName)
} // Hard bounded

exampleOfHardBinding() // 1st Call
setTimeout(exampleOfHardBinding, 100) // 2nd call
// hard bound 'exampleOfHardBinding' can no longer have its 'this' overridden
exampleOfHardBinding.call(window) // 3rd Call