AkashRajvanshi

const user = {
  firstName: 'Akash',
  lastName: 'Rajvanshi',
  fullname: function () { // Method
    return `${this.firstName} ${this.lastName}`
  }
};

console.log(user.fullname()) // Akash Rajvanshi

AkashRajvanshi

function sayName(firstName, lastName) {
  console.log(`${firstName} ${lastName}`)
}

sayName('Akash', 'Rajvanshi') // Akash Rajvanshi

// We can also call the function through call.
// first Parameter passed into the function call replaces the this context.
// Other values passed into the functions behave as  normal agrguments 
sayName.call(null, 'Akash', 'Rajvanshi') // Akash Rajvanshi

AkashRajvanshi

const numbers = [1, 2, 3]  // Array

// Normal Method
const newArray = numbers.slice()
console.log(newArray) // [1, 2, 3]

// Another Method
const anotherNewArray = Array.prototype.slice.call(numbers)
console.log(anotherNewArray) // [1, 2, 3]

AkashRajvanshi

function sayName (firstName, lastName) {
	console.log(`${firstName} ${lastName}`)
}

sayName.apply(null, ['Akash', 'Rajvanshi']) // Akash Rajvanshi

AkashRajvanshi

function sayName (firstName, lastName) {
	console.log(`${firstName} ${lastName}`)
}

const sayMyName = sayName.bind(null, 'Akash', 'Rajvanshi')
sayMyName() // Akash Rajvanshi

AkashRajvanshi

const obj = {
	'Can be any Number!': 5832
};

console.log(obj['Can be any Number!']) // 5832

AkashRajvanshi

const user = {
  firstName: 'Akash',
  lastName: 'Rajvanshi',
  fullname: function () {
    return `${this.firstName} ${this.lastName}`
  }
};

console.log(user['first' + 'Name']) // Akash

AkashRajvanshi

const user = {
  fullName: function () {
    return `Akash`
  }
};

console.log(user['fullName']()) //Akash

AkashRajvanshi

const user = {
  firstName: 'Akash',
  showDetails: function () {
    return `${this.firstName} ${this.lastName}`
  }
};

user['lastName'] = 'Rajvanshi'
console.log(Object.keys(user)) // [ 'firstName', 'showDetails', 'lastName' ]
console.log(user.showDetails()) // Akash Rajvanshi

AkashRajvanshi

console.log(delete user['lastName']) // true
console.log(Object.keys(user)) // [ 'firstName', 'showDetails' ]