ES6 Tutorial #2: var, let and const | Variable Scope | Modern Javascript 2021

ES6 Tutorial #2: var, let and const | Variable Scope | Modern Javascript 2021.

let and const are 2 keywords that are added in ES6 to declare variables.
In ES5 var keyword is used but some issue are attached with var because only function can create a scope when we use var, anything inside function is private and anything outside function is global and block don't create scope in ES5 which leads to issue because sometime data may override our variable.
So to control the accessibility of our data ES6 introduced let and const which allow you to create block scope.
Now in ES6 unlike ES5 we can't redeclare a variable with same name and we can't use the variable before declaring it.

On other hand const are similar to let , the only difference is const are used to create read only values, which can't change.

There is one practice question at time , so take a look and comment me your answer.

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#letConst​ #ModernJavaScript #NishaSingla

[harika]

Great Inside block : GoodMorning
Great Outside block : Hello

[myvue]

Awesome explanation, god has given good explanation power to you, your teaching services are very help to software engineers. I really enjoyed a lot, thank you.

[sajidahmad]

The way you teach it's really incredible. I have watched all your videos.

[swaroopk]

I see that u r remembering each small and minute rules of javascript...either it comes with great practice or memory power...subscribed

[ranjanpanda]

Nisha, your are doing a great work... God bless you... Thanks for all your effort.

[lakshminadakuditi]

You are my lovely teacher. The way of your teaching very very excellent. I watched all ur videos

[samarscript]

11:50 Output :

Greet inside console Good Morning
Greet outside console Hello

[harishb]

Amazing Nisha Singla... Almost spoon feeding ❤😅
Accidentally came accross. Subscribed

[moonboy]

You are an amazing teacher, Thank you so much Nisha

[Harsha-vskl]

greateinside block : Good-morning
greate outside lock : hello

[ChandanSingh-jsos]

<script>
let greet = "Hello";
{
let greet = "Good Morning";
document.write("Great Inside " + greet + "<br>");
}
document.write("Great Outside " + greet);
</script>

Great Inside Good Morning
Great Outside Hello

[madhavikesana]

So nice... Got good clarity.. Thank you so much...❤️

[nilayshukla]

Nisha, Heartly I"m thanking you Your way of teaching is so awesome Please post videos of Redux JS too if

[vasanthapandiyanm]

Greet inside console Good Morning
Greet outside console Hello

[s_w_i_m_p_r_o]

yeah i was a amazing session i learned a lot but you should make some videos in HINDI also because lot of people they could't understand ENGLISH properly
THANK YOU

[olivebishop]

does this rules apply nowor js has changed

[sss]

could please explain, callback and callback hell, clouser videos

[SubrahmanyaMalali]

Greet inside console Good morning
Greet outside console Hello

[Abhisheksoft]

Hello ma'am muje javascript learn krna hai kafi time ho gya learn nhi kr pa raha hu

[rayganmudberry]

Output:

Greet inside console Good Morning
Greet outside console Hello