#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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[jvsnyc]

Excellent presentation. In the lesson task we might want to use the wording "what output will the code produce?", rather than "what will it return?", as in a lot of cases both have a defined answer and are different.

[ifunanyablessing]

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. ❤❤

[handmadeandmore]

You should have millions of subscribers

[iruga]

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

[michaelkatiba]

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

[itsnobledean]

Consistent. Informative. Knowledgeable.

[ifunanyablessing]

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

[kiranshelar]

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

[danielbentum]

<script>
// WHAT IS WRONG WITH THIS AND WHY????

const numbers1 = [45, 4, 9, 16, 25];
const numbers2 = numbers1.map(myFunction);
= numbers2;
let double = 2;
function myFunction(value, index, array) {
value *= double;
return value
}
</script>