There have been numerous articles published on the internet regarding the basics and practices of JavaScript basics. Honestly speaking, you can't master JavaScript fully; there is always something to learn about.
Today, in this post, we'll be going beyond those casual topics and discussing Java's advanced and basic concepts. Undoubtedly, JavaScript is the #1 programming language used to develop stunning applications. Around millions of web pages are created in JavaScript.
Most Java developers use the concepts we'll be talking about, and newbies should also know about them.
https://www.youtube.com/watch?v=ZYhGSfSfzeI
So, without further ado, let's break down the basic and advanced concepts of JavaScript.
Let's Start With The Basics Of JavaScript
- Scope
In JavaScript, the scope is referred to as variable access. The developer is always in the default root scope in this programming language, also known as the window scope.
The scope structure is a small box with different boundaries of variables, objects, and functions. These boundaries actually restrict the variables, and there is a unique way to access the blocked variables.
Having a clear understanding of the JavaScript basics is essential for understanding scope and variables. If you don't understand this basic concept, your codes will lack readability, and you will struggle to separate the logic from the codes.
There are actually two different scopes, i.e., global scope and local scope. In the local scope, you can access everything within the boundaries. On the other hand, the elements outside the box are considered globally.
- Immediately Invoked Function Expression (IIFE)
As the name suggests, this is another concept that comes in the JavaScript basics category where this function is invoked and executed simultaneously after getting determined. IIFE cannot be accessed by the elements outside of the box, which also helps global scope from getting polluted.
One of the primary reasons for using IIFE is executing the codes immediately and obtaining data privacy.
- Hoisting
A lot of developers struggle while understanding JavaScript basics, including hoisting. Hoisting is very easy to understand, but developers still find learning challenging.
JavaScript is one of the finest programming languages where you can call the function before it gets defined without experiencing any errors. Hoisting plays a vital role when the function declaration and variables move from local scope to global. During this transition, hoisting ensures that you don't get the error message "UncaughtRefereneceError.'
- Closures
Believe it or not, if you master the closures, you will never struggle to understand the JavaScript basics. It is one of the simplest concepts of this programming language comprehensively discussed in numerous blog posts.
Undoubtedly, closures are easy to understand, but that doesn't mean they are simple to use while coding. The closures' key role is to enable the variable scope to extend beyond any restrictions.
To create a closure, you need to build a function inside another function. The newly built function gets access to the variables in the parent function. Closures should be used while developing properties and objects in object-oriented scripts.
- Callbacks
In this programming language, a callback is a function that transmits to other functions and is further executed and invoked. Here, one function has to wait for another to be invoked and executed, leading to a chain of functionalities.
The Advanced Concepts Of JavaScript
- Promises
Above, you have understood the callbacks; now it's time to learn the advanced concepts instead of JavaScript basics.
What will you do if your code has callbacks and more callbacks are getting established into each other?
This kind of activity and structure of callbacks is known as ''callback hell'', and the only savior is ''promises.'' With promises, you can resolve this kind of problem.
This element is very useful when dealing with asynchronous JavaScript operations when you're about to execute chaining callbacks (also known as back-to-back operations). A promise is an element that enables developers to create rejected or resolved reasons.
The definition of promises is an element indicating failure or conclusion of the asynchronous operation. In other words, promises are an element that comes under the category of rejected objects where you can attach the callbacks.
A promise can occur in three possible states, which are as follows:
- When the operation is failed
- When the operation is not failed, neither completely concluded
- When the operation is completed successfully
- Object Literals
Object literals are essential while dealing with functions accepting numerous optional arguments. Many developers ignore these optional arguments that further show error messages and decline the entire operation.
The best solution is to use the object literals and slowly pass a single optional argument to avoid complicating the entire operation. As a result, the actual arguments become easy to understand, read, modify, and update because the relation between the actual arguments is direct.
You should only use the object literals when it's challenging to deal with the collection of optional arguments.
- Namespaces
Suppose you're doing some raw coding in this programming language and realize that you can make relevant additions on the same page. In that case, you can avoid further complications by allotting unique namespaces to your codes.
Object-oriented namespaces are used because all the properties and methods are determined inside the objects, reducing the chances of potential complications. Incorrect object names can give rise to numerous conflicts.
Furthermore, these conflicts occur silently, and you may not know about this issue until the entire operation is rejected or fails. To avoid potential conflicts, you should allot unique namespaces to your own codes.
Many developers avoid using namespaces, but it's a great weapon to prevent some serious complications within a few clicks.
Final Thoughts
Although it's tough to discuss the JavaScript basics and advanced concepts in detail in one post, we hope you've at least got a fair idea about some popular JavaScript basic and advanced concepts. If you're interested in learning Java or already using JavaScript, you should definitely research more about these concepts. So, learn JavaScript and become an industry-ready and skilled programmer and stay tuned with our posts.
Thanks for reading our blog post!
58 
