variable.js

const account_Id = 144553
let account_email= "brajeshmewada694@gmail.com"
var account_pasword= "12345"
account_city= "sehore"
let account_state;    //ese undifine variable kahte he
// account_Id=2
account_email="raj@gmail.com"
account_pasword="80976"
account_city="bhopal"
console.log(account_Id)
console.table([account_Id,account_email,account_pasword,account_city,account_state])


// run karne ke liye node ke bad me file ke name
// js me var ka use nahi hota he 
// esme let or const dono variable ka use hota he bas


let score = null
console.log(typeof score)  //o/p = object
console.log(typeof (score))//o/p = object
// typeof function ka use variable ke type ko pata karna hota he



let valueInNumber= Number(score)
console.log(typeof score)




// 33==> "33"  eska type string hi aata he 
// "33abc"==> Nan
// True==> 1;  
// False==>0