How do you access a variable outside a function in JavaScript? JavaScript is a text-based programming language used by clients and servers that allows you to make web pages interactive. While HTML and CSS are the languages ​​that provide structure and style to web pages, JavaScript provides interactive elements of web pages that engage the user.
Familiar examples of JavaScript you might use on a daily basis include the Amazon search box, a news summary video embedded in the New York Times, or refreshing your Twitter and Facebook feed.
JavaScript is mainly used for web-based applications and web browsers. But JavaScript is also used offline in embedded software, servers, and hardware controls. Here are some basics of using JavaScript;
Add interactive behavior to web pages
JavaScript enables users to interact with web pages and you are not restricted regarding what you can do with JavaScript on websites – these are just a few examples
Show or hide more information with the press of a button
Change the button color when you hover over it
Swipe through the picture carousel on the home screen
Enlarge or reduce image
Display a timer or countdown website
Play audios and videos on webpage
Show animation
Use the burger drop-down menu
Development of web and apps
Developers are able to use several JavaScript frameworks for the development of web and mobile applications. JavaScript Frames is a collection of JavaScript code libraries that provide developers with ready-to-use code that they can use for routine programming functions and tasks – literally a framework for building websites or web applications
Common JavaScript front frames are React, React Native, Angular, and Vue. Most of the companies use Node.js, a JavaScript runtime environment based on the Google Chrome JavaScript V8 engine. Some famous examples are PayPal, LinkedIn, and Netflix!
Build web server and develop server application
Apart from websites and applications, developers can also build simple web servers with JavaScript and develop backend infrastructure with Node.js.
Game Development
You can equally use JavaScript to create browser games. This is a great way for beginners to practice their JavaScript skills.
Why Should Javascript Be Preferred to Other Languages?
In addition to the endless possibilities, there are many reasons for web developers to use JavaScript before other programming languages:
JavaScript is the web browser’s only native programming language
JavaScript is the most popular language
There is a low entry threshold
It’s a fun language to learn
How to access variable outside function in JavaScript
The easiest way to compare strings regardless of the case in JavaScript is to use the to Lower-Case () or to Upper-Case () methods to ensure that both strings are all lowercase or all uppercase.
Both Strings include () and String indexOf () are both case-sensitive. No function supports regular expressions. To search case-independent, you can use regular expressions and the String-match () function or you can convert strings and subsets to lowercase using the String to Lower-Case () function.
Thereafter, you can convert the passed-in string to lowercase. The ES6() array method filter can easily solve the solution in one line by using the include () method to determine if the array has a certain value in its record along with the contains to Lower-Case () method to convert it to lowercase.
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