class-5(rest, spread, destructuring)

//loop (way of looping)
//function (default parameter)
//Destructing, spreading
//nested object, array access

//Loop(Repeating things)
// for (let i = 0; i < 10; i++) {
//   let occurrence
//   if (i <= 1) {
//     occurrence = 'time'
//   } else {
//     occurrence = 'times'
//   }
//   console.log(`I Love Bangladesh ${i} ${occurrence}`)
// }

//Looping array and get the sum
// function sum(arr) {
//   let sum = 0
//   for (let i = 0; i < arr.length; i++) {
//     sum = sum + arr[i]
//   }
//   console.log(sum)
// }

// sum([1, 2, 3, 4])


//Extra (passing regular value and looping up t the point)
// function sum(num) {
//   let sum = 0
//   for (let i = 0; i < num; i++) {
//     console.log(i)
//     sum += i
//     // sum = sum + arr[i]
//   }
//   console.log(sum)
// }

// sum(4)



//Looping array
// const arr = [1, 2, 3, 4]

// for(let i = 0; i < arr.length; i++){
//   console.log(i)
//   console.log(arr[i])
// }


//automatic semicolon insertion(Interview Question) and Odd behavior
//default parameter

// function showInfo(name = 'samim', random, country = 'Bangladesh') {
//   return `I am ${name} and I Love ${country}`
// }

// console.log(showInfo('Hasan', 'India', 'Pakistan'))


//More common and generalized loop
//simple for loop
//while loop, do while loop

//array specific
//forEach
//for of
//for in (NotRecommended- No order)
//array helper method(map, reduce, ...)

//object specific
//for in

//forEach loop
// const arr = [1, 2, 3, 4]
// arr.forEach(num => {
//   console.log(num)
// })

//for of loop
// for(let num of arr){
//   console.log(num)
// }



// const obj = {
//   firstName: 'samim',
//   lastName: 'Hasan'
// }

//Looping object(for in)
// for(let prop in obj ){
// console.log(obj[prop])
// //  console.log(prop)
// }


//Applying array looping technique with object using keys() values() entries()

// console.log(Object.entries(obj))
// for (let prop of Object.entries(obj)) {
//   console.log(prop[1])
// }

// for (let prop in obj.keys()) {
//   console.log(obj[prop])
//   //  console.log(prop)
// }



// const arr = [1, 2, 3, 4]

// const num1 = arr[0]
// const num2 = arr[1]
// const num3 = arr[2]
// const num4 = arr[3]

const arr = [1, 2, 3, 4]
//destructuring
// const[num1, , num3, num4] = arr

//rest operator
const [num1, ...restArr] = arr

console.log(num1, restArr)



const obj = {
  firstName: 'samim',
  lastName: 'Hasan',
  age: 27
}


//Object destructuring and rest operator
const {lastName:lName = 'blabla' , ...restObj} = obj
console.log(restObj)
// console.log(fName, lName)


// const arr = [1, 2, 3, 4]

//spreading arry
// const newArr = [...arr, 6]
// console.log(newArr)


//spreading object
const copiedObj = {
  ...obj,
  profession: 'web developer'
}

console.log(copiedObj)



//remember(!!) Extra [] in using rest values as function parameter
// Little useful technique
// function showProfile({firstName, ... rest}){
//   console.log(firstName, rest)
// }

// showProfile({
//   firstName: 'samim',
//   lastName: 'Hasan',
//   age: 27
// })



//nested array and object value accessing
const obj1 = {
  obj2: {
    obj3: {
      hi: 'Hello',
      nums: [1, 2, 3]
    }
  }
}
console.log(obj1.obj2.obj3.nums[2])

const arr1 = [[1, 3, [10, 12], 4], 6, [9, 10]]
console.log(arr1[0][2][1])