#39 Understanding JavaScript Scope | JavaScript Full Tutorial

In this lesson we learn all about JavaScript Scope, understanding scope is a really important part of learning JavaScript, in this lesson we'll do a deep dive and cover global scope, local scope, functional scope and block scope, we'll also see how these all relate to the differences between var, let and const.
0:00 - Intro
0:42 - What is Scope?
1:21 - Global Scope
2:35 - Local Scope
7:27 - Functional Scope
9:20 - Block Scope
11:29 - Lesson Summary
12:19 - Lesson Tasks
15:30 - Outro and Up Next
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[@michaelkatiba]

Well explained, you'all remember to subscribe, you won't regret it!

[@ifunanyablessing3411]

Thank you so much @Dev Dreamer. I am lucky to have discovered your channel. So basically, I use a paid course to learn JavaScript so that I can study using the correct road map, but I use your channel to understand each concept like it's been explained to me one on one in a classroom. ❤❤

[@iruga7379]

Fantastic. You just killed all my doubts about why we should be using LET instead of VAR.

[@DevDreamer]

Amazing! Thanks for watching 🙂👍

[@dontnowatimdoing446]

Underrated channel. Great job

[@vamsikrishna4972]

thanks bro u cleared all my doubts

[@kiranshelar2961]

Excellent explanation 👍🏻👍🏻🔥

[@MrFlamerFuel]

lesson 38+39 earned you a sub! ;)

[@itsnobledean9450]

Consistent. Informative. Knowledgeable.

[@meysam8357]

amazing video thank you

[@dreamscomingtrue2446]

thanks man .I understood it .

[@appustudio8637]

cool! thanks for the update.

[@JimmyKama]

This a a great tutorial!👍👍👍

[@goranstanarevic1411]

man you're great

[@prabu2778]

You got a new subscriber today

[@ifunanyablessing3411]

would appreciate if u can make more videos on advanced JavaScript and React framework

[@kiranshelar2961]

Are you planning to do javascript interview exercises too, at the end of this course?

[@danielbentum136]

// WHAT IS WRONG WITH THIS AND WHY????
const numbers1 = [45, 4, 9, 16, 25];
const numbers2 = numbers1.map(myFunction);
document.getElementById("demo").innerHTML = numbers2;
let double = 2;
function myFunction(value, index, array) {
value *= double;
return value
}