JavaScript Variable Scope (Clip 10): Gentle Introduction to JavaScript

Information is often restricted, or scoped, to limit its access. You'd expect a letter put into a mailbox to be only for the person who owns the box. And a poster out on a pole to be accessible to anyone. So data in a mailbox is scoped to that mailbox. And data on a pole is globally scoped and available to everyone.

In programming, scope determines which variables are accessible from which parts of the application. There are three main types of scope in JavaScript: block scope, function scope, and global scope

We examine each type of scope and demonstrate declaring variables of different scope.

*Lesson Links*

*Content*
00:00 JavaScript variable scope
00:43 Block scope
01:35 Function scope
02:16 Global scope
02:53 Coding Along: Variable scope
03:10 Demo: Block scope
04:01 Demo: Function scope
05:26 Demo: Global scope
05:42 Key points

*Audience*
• Anyone new to JavaScript.
• Existing developers that use JavaScript, and want to understand more about its syntax and how to use it on the web.
• Students considering a programming or web development career.
• Creatives that want a give their web pages some interactivity.
• Those that manage or interact with web developers to better understand what JavaScript is and how it is used.

This is the sixth and final course of the "How to Become a Web Developer" series.

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😊About Me
Hey! I'm Deborah Kurata
I'm a software developer and YouTube content creator. I speak at conferences such as VS Live and ng-conf. I write articles for freeCodeCamp. And I'm a Pluralsight author with courses in the top 10 most popular (out of 10,000+) over the past 5 years. For my work in support of software developers, I've been recognized with the Microsoft Most Valuable Professional (MVP) award, and I'm a Google Developer Expert (GDE).

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