Do you have quality products and services displayed on your webpage but are still unable to crack any sales? The problem might be your webpage. A webpage that is not user-friendly or visually appealing fails to generate sales.
The solution for this problem is using JavaScript in creating webpages for your business to offer a dynamic user experience. Now you might be wondering how to learn JavaScript to use it. The key to learning this complex programming language is understanding its main concepts. Once you have a firm grasp of the basic concepts of JavaScript, you can use this programming language efficiently. If you’re struggling to learn JavaScript’s main concepts on your own, you can always come to us, as we have a network of highly skilled JavaScript tutors on our panel. Superprof ensures to teach you all the basic to advanced concepts of JavaScript so that you can create great webpages.
Continue reading to get a quick heads-up about JavaScript and its main concepts.
What Is JavaScript?
Invented by Brendan Eich in 1995, JavaScript is a programming language that creates dynamic and interactive effects on web pages. From adding animated 2D/3D graphics, interactive maps, and scrolling video jukeboxes to controlling multimedia, updating timely content, and reducing the loading time, JavaScript offers dynamic functionality. Learning JavaScript is highly beneficial for programming students as it helps them build more interactive websites.
Many people use HTML and CSS instead of JavaScript in their web pages, which results in almost nil user interaction. JavaScript is the third layer of the standing web technology cake –the first two being HTML and CSS. Let’s see how:
| Programming language | Role |
|---|---|
| HTML | HTML is the primary language used in making a webpage. HTML gives structure and meaning to web content by defining headings, data tables, and paragraphs or inserting images and videos. |
| CSS | CSS is the secondary language used to style HTML web content. For instance, choosing background colors and fonts or setting content on columns. |
| JavaScript | This is the third language used in webpages to update content, control multimedia, lower loading time, animate images and handle other technical aspects to offer a dynamic and interactive user experience. |
Whether you are a skilled developer or interested in learning how to code, JavaScript should be your primary programming language, as, without it, you cannot code effectively.
JavaScript is used for coding and running different technical aspects of web development. This makes your web page smooth and streamlined, improving the overall user experience. JavaScript is an excellent scripting language used by around 1.8 billion websites in the world, which shows its growing popularity.
What Are the Main Concepts in JavaScript?
Amazed by how JavaScript ensures a dynamic and interactive user experience on your webpage? You must be thinking about how to learn this programming language. JavaScript is a hard language to learn as it comprises several complex concepts and features. The key to mastering this tool is thoroughly understanding its main concepts.
Here are some of them:
Scope
A fundamental concept of JavaScript is scope. This determines the accessibility of variables, objects, and functions from different parts of the code. In simple terms, it assesses which programs have access to the variables and where variables are visible.
The scope is a necessary feature in JavaScript as it offers security. This is because scope lets variables be accessed from specific program areas, stopping hackers and unauthorized users from using your webpage for unconscionable purposes. You can access the variables from limited places, offering more client data security and privacy. Scope in JavaScript also reduces namespace collisions, making you use the same variable names in different scopes.
IIFE (Immediately Invoked Function Expression)
The JavaScript IIFE (Immediately Invoked Function Expression) concept is self-explanatory. This function in JavaScript is used to invoke and execute a variable immediately. This way, the variable cannot be used by the outside world. Not only does this function prevent the global scope from getting contaminated, but it also offers data privacy as the IIFE immediately executes the code. Classes in JavaScript cover this topic as it is a basic function of JavaScript.
Hoisting
Hoisting is another major concept in JavaScript. This process refers to moving the function declarations and variables to the top of their scope before code execution. This means that no matter where the functions and declarations are declared, they are automatically moved to the top of their scope regardless of being a local or global scope. A major benefit of this function is that you will not get an ‘Uncaught ReferenceError’ as the interpreter will move the variables and functions to the right place before the code execution.
Proficiency in these tools can help students unlock various rewarding career opportunities in the tech field. Looking for a place to get started? Superprof has a network of qualified tutors, offering affordable JavaScript classes at all levels.
Closures
Closures are a significant function of JavaScript. They are based inside another function, having access to the outside function variable. This means that the inner function can access the variable in its own scope, parent scope, and global variables. However, the outer function cannot have scope in its inner function variable. Closures come in handy in various areas of coding. Its benefits include:
- Providing data encapsulation
- Attaching variables to an execution code
- Aids in maintaining modular code
- It helps in removing redundant code
- They enable you to stick variables to an execution context
- Variables in closures can assist in maintaining a state that you can use later
Callbacks
Another exceptional feature of JavaScript is callbacks. These are functions that are passed on to another function as a parameter. This is then invoked and executed in the other functions. At this stage, the function is required to wait so that another function returns a value, making the chain of functionalities. The major benefit of callback in JavaScript is that it offers synchronous capability as it is used in the programming language’s asynchronous operation.
Promises
Promises are a feature of JavaScript used when the callback concept acts up. Although the callback feature is super-efficient, what would happen if your code receives callbacks within callbacks and it goes on? This repetitive circle is typically called ‘callback hell.’ This is where the concept of promises steps in to solve this issue.
The promises tool is used when two back-to-back operations are needed to be executed. This feature is used in asynchronous JavaScript operations when a subsequent function begins after the previous one is completed. Promises produce values, which will be produced sometime in the future. These are either a resolved value or a rejected one, explaining why it is not resolved. As a result, promises solve the recursive issue of ‘callback hell.’ The promises tool can be used in three situations including:
- When the operations are entirely successful (Fulfilled)
- When the operation is entirely failed (Rejected)
- When the operation is in the initial stage, neither fulfilled nor rejected (Pending)
These are some of the major concepts of JavaScript. We understand these concepts may be challenging to learn as JavaScript is a highly advanced programming language. However, you do not have to worry about that, as you can always consult us and hire a JavaScript tutor from our platform for personalized lessons.
Learn JavaScript With Superprof
Learning JavaScript on your own can be challenging, especially if you don’t have any experience with programming languages. Private classes in JavaScript from Superprof can help you. Superprof comprises several JavaScript tutors on its platform with extensive knowledge, experience, verified reviews, affordable per-hour rates, secure payment methods, and advanced online class technology. This makes us the best fit to learn JavaScript efficiently.
We have helped several students in mastering this programming language. Visit our website today to browse and choose from our wide network of qualified tutors and begin your journey to coding like a pro.
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