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What are the top tips to write the best JavaScript code?

Lately i have been researching about the top tips to write the best JavaScript code but coulddn't get to any conclusion. Can anyone please help me out with that.

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Posted 4 months ago

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1. Grasp The Basics More Thoroughly

I will start with a very naive concept and statement that you have been hearing since childhood. Learn and practice the basics. Many times it so happens that you are applying the logic with coding but forget that there is an already built in function for that like slicing an array. Sometimes, you get an error while running the JavaScript code and due to it, many other functionalities are also not working. Just a small colon or inverted commas can cause this. These things happen due to unclear basics. A simple loop like for, which or do while is used many times in a single program. Loops are very basic things inside programming. If you are not clear with the looping and other basics, it is really very hard to code and even get a chance to get hired for a company. It is very important to brush up your basics as they give you a strong base on top of which you can build the complex logics of a solution and strong reputation.

2. Use Functions To Define Different Modules, Even If They Are Small

Functional approach is a great approach in programming. Why? It divides your program in the modules that work together but is still apart. Let me take an example to clear it out. There is a function to calculate Root Mean Square of the numbers. For this, you need to square the numbers, take their mean and their take square root of the mean. There are three steps involved in it. Therefore, we can make use of three functions. But see, all these functions are interlinked. The output of one goes to another and we get the final answer then. Now, let’s say instead of three functions, you are using only one function to calculate RMS using various variables. As you see, the final answer is wrong. It will become really hard for you now, to check where what went wrong in such a big function. Instead, having three small functions will help you analyze quickly. Hence, use functions to define various modules of the code, even if the functions are small. This tip would work like magic to help you become a JavaScript master.

3. Keep Cross Browser Compatibility In Mind

When you work in web development, the main issue to keep in mind is cross browser compatibility. Cross browser compatibility briefly means the representation of your website on different browsers. Not all websites use identical JavaScript code, & different browsers render JavaScript differently, leading to browser compatibility issues. These issues are not easy to resolve once your website is complete and you did not check it online. For this, earlier people used to follow the exhaustive and conventional method of checking the website on different browsers and versions individually. Not anymore though, today online browser compatibility testing tool such as LambdaTest have taken that headache for you. You just need to enter your website name and select the versions and browsers (along with the operating systems) on which you want to test the website. This will create a virtual machine on LambdaTest servers and you are good to go. You will get detailed report along with screenshots and you can also run your website as if it is running on the browser.

4. Use Object-Oriented Approach

Object-oriented approach is the most famous approach used today in programming. Started from C++, object-oriented approach has been exponentially popular since. All of the major languages are today invented in object-oriented style only. An approach oriented towards an object is called an object-oriented approach. An object becomes a basic entity then. This object is then taken as a base and used to apply properties and functions to the page. For example, I create an object car. This object can be wrapped with many functions such as colour, specifications, price, etc and everything that we do is on this object. We can select a car. Colour (“red”) to change the car colour to red. Similarly, we can change the price by car.Price(“50”). An object is a base for everything that you do in the programming language. Now, it is not important to create an object and use them. They are used in object-oriented approach but you can also go through the conventional approach of just writing the code top to bottom without any functions and object. This is too exhaustive and is never recommended. As we discussed above, a functional approach should be used while writing the code and if we are using functions, we use objects. So, try to convert your exhaustive code to the object-oriented code in the beginning and practice writing your code always in an object-oriented style. When you will read the code of others, you will be looking at object-oriented approaches all the time. So it is better you have your hands on it if you wish to become a JavaScript master.

5. Perform Testing To Have A Near Perfect Code

This part is as important as the development part. You can never know while developing that whether your code is wrong. JavaScript is used on a website or to develop a web page. A web page is for a user who will be accessing your website. A user can input many things when it comes to your JavaScript forms, let suppose. You, as a developer obviously will not invest your time in checking each and every possible input that can be entered by a user. This is where testing comes into play. Testing helps you with finding bugs that are highly unlikely to check while development. They are of different types like when a user enters the number on a text field etc. Testing helps you write more efficient code and develop a great website. This, in turn, will increase your understanding related to the product aesthetics & help you excel to become a JavaScript master.

6. Error Handling

If you are into coding, your code is prone to errors. Normally, if you are working on a big project, errors are a common thing. And they should be. They open other possibilities that you might not have thought about while writing the code. But these errors are needed to be handled correctly or else they disturb the flow of the program. Now, console.log is a conventional method to log errors. But they are extensive and time-consuming. To handle the errors more efficiently, you can use the Error Objects. An error object looks like,

st err = new Error(‘Please improve the time complexity of the code’)
console.log(err.message) // please improve your code

This gives you the power to display an error message too. You can also use try, catch and finally to apply validations on your code. If an error is found in the code in the try block, you can jump to catch block to either execute an error code or display some message. Finally, block executes the code in all the cases, whether there is an error or not. A sample code is given below:

try 
{
//code
}
catch (Exception e)
{
//code
}
finally
{
//code
}

7. Use Tools According To The Problem

JavaScript is not a new language. It is as old as I am. And when a language survives this long in the highly competitive computer science world, it has something special and powerful in it. When something so powerful exists, web developers generally give it more power by creating libraries. These are very powerful libraries and ease out many things. Although sometimes a library is created for a specific purpose like Reasonml created by Facebook for themselves. The reason is a JavaScript flavor 52% of developers don’t know about! Now, as a developer, you have some specific requirements for the project you are working on. This special requirement can be served via a specific tool. For example, say you are building a website for shipping apple accessories, it becomes necessary that your website delivers a smooth UX on every device, especially on iPhones, iPads, macOS. But how would you make sure of it when you don’t have access to them all?

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Posted 3 months ago