Lecture 28

 

// let

// var

//const

//datatype

//number

//String

//Bool

//double

//array

//function

//obj

//null

// var firstName = "bilal"

// console.log(firstName)

// var firstName = 'Ali'

// console.log(firstName)

// firstName = -10

// console.log(firstName)

// firstName = true

// firstName = false

// firstName = -10.2292382

// let firstName1 = "bilal"

// console.log(firstName1)

// let firstName1 = 'Ali'

// console.log(firstName1)

// firstName1 = -10

// console.log(firstName1)

// firstName1 = true

// firstName1 = false

// firstName1 = -10.2292382

// const value = 10

// console.log(value)

// value = 20

//scope of variables

let a = 20, b = 30

function sum() {

    let a = 40, b = 60

    console.log(a + b)

}

sum()

console.log(a)