Variables and their scope in Java Script!!!

Variables in JS

                   There are three keywords in JS used to declare variable:

1.var:-a variable declare with var is defined throughout the program as compares to let.

2.let:-It is declare a block scope local variable ,optionally initializing it to a value.Var is function scoped whereas let is block scoped.

3.Constants: are read-only, therefore you can not modify them later on.

let fname='Prit '

var lname=123

// 3 ways of printing 

console.log(fname + '-' + lname)

let fullname = fname +'**'+ lname

console.log(fullname)

// constant

var score = 100

score = 130

const bonus = 50

var finalscore = (score + bonus) *1.8

console.log(finalscore)

Scope of different Variables in JS

let iamGlobal ='something global'

if (true) {

    //using let scope of local variable only inside block

    let iamLocal='some local value '

    

    //change the value

    iamGlobal='New value'

    console.log(iamGlobal);

    console.log(iamLocal);

} 

//scope anywhere

console.log(iamGlobal);

//getting error while try access it. 

//console.log(iamLocal);

//<*---Var---*>

if (true) {

    console.log('Concept of var keyword')

    var imLocal = 'some local values i have :)'

    console.log(imLocal)

}

//using var local variable can access outside the block

console.log(imLocal)

In the next post we will go with Undefined and null values in js.
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