훌륭한 자바스크립트 개발자는 이렇게 합니다👇

// Declaring at the beginning
let alpha, beta, omega

// Use them at later stage
alpha = " the leaders"
beta = "followers"
omega = "viewers"

// Declaring and initiate at the beginning
let alpha = "The leaders"
let beta = "Followers"
const omega = "Viewers"

let teacher = {name:"Mursal", subject:"IT"}
teacher = "He who teaches"

const teacher = {name:"Mursal", subject:"IT"}
//Throws an error at this line since not possible
teacher = "He who teaches"

let x = "Hello" // type = string
let x = 5 // change: type = int

function (a=1, b=2){
     /*function code/
}