10 Useful Javascript Tips and Tricks

Konfinity
December 10,2020 - 7 min read
10 Useful Javascript tips and tricks

Over the years, there has been a significant increase in the number of frameworks, libraries, tools and languages that are used to build technological applications. One such language that has emerged as one of the most popular languages in the IT industry is Javascript. It is a prominent language and offers a promising career with great remuneration. Owing to its lucrative prospects, the job market for Javascript developers is very competitive. You can read this blog to understand the importance of Javascript and why you should learn it.

Javascript was initially built as a scripting language which was used to add dynamic content on a webpage. With the help of Javascript, websites have now become more interactive, dynamic and attractive. It is one of the most popular as well as useful languages in the world of front- end development. However, Javascript can also be used as a backend language.

A Javascript framework called Nodejs enables Javascript to be used in the server- side development. Nodejs, built on Chrome’s V8 engine and written in C++, is basically a runtime environment that uses Javascript as its scripting language. You can read more about Nodejs in this blog. The MERN (MongoDb, Express, React, Nodejs) stack and the MEAN (MongoDb, Express, Angular, Nodejs) stack are popular examples where Javascript (Nodejs) is used as a backend language in web development.

Javascript is a complex language. Although it is easy to learn the basics but it can be really daunting if you are writing a long, complex code. In order to become an accomplished Javascript developer, It’s important to know some Javascript tips and tricks. If you are well versed with the basics of Javascript, it’s a good time to learn some tips and tricks to make your code easily understandable by other developers. it’s important to incorporate these Javascript tips and tricks and write simple code so that your programs are easy to follow. In this blog, we have compiled 10 useful Javascript tips and tricks. Let’s get started!

  1. Declaration and Initialisation

    Declaration of variables late in the program is not at all a good practice. You should declare all the variable in the beginning of the program, it’s like taking out all your tools before starting a job. Declaration of all variables before getting into the code of you function gives easy access to and understandability of the program. Apart from declaration, it’s best to initialize your variables at the time of creation so that none are left undefined. An example of an ideal code snippet is given below.

    • <script>
    • var x = 5;
    • </script>
  2. Build Specialized Functions

    Javascript functions should only focus on a single task that it sets to accomplish. As a developer you should write the function in order to complete that task only. Another important thing is to name the function to match the particular task so that it is easy for you and others in the team to identify the function. A function written in this way is simpler and less extensive and hence easier for others to read and understand. Make sure your function is only working toward one task. In this manner, your Javascript code would have several functions, each dedicated towards one particular task. You can have a look at the example given below to better understand specialised Javascript functions.

    • function RegisterStudents (name, reg_no) {
    • //register students
    • }
    • function sendMessage (message, id) {
    • //sends an email to students
    • }
  3. Crisp and Concise Code

    As a good developer, you should make the Javascript code as crisp and efficient as possible. Look out for instances in your code for identical lines of code and move them into a function. Call the function in places all the instances where those duplicate lines were used before. Make function according to the earlier point of modular of specialised functions. A concise code without any redundant code reduces visual clutter and also aids in debugging.

  4. Comment Often

    Commenting is the best to make your code easily accessible to other coders and developers in the team. They save your fellow developer’s the time it would take to find out what the particular code fragment means on their own.

    A code adorned with comments is also easy to debug in case it does not work as expected. Hence, it is best to leave comments after every important chunks of code. Even if you are unsure, you should leave a comment because you can always delete it later if it’s too much clutter.

    • //declares and initializes a string
    • <script>
    • var x = “Konfinity”;
    • </script>
  5. Do Not Overuse Recursion

    You should avoid nesting recursive functions too many levels because it can be difficult to understand the logic of the code at one glance. You should look for instances where recursive functions can be pulled out of their nested place without significant runtime cost. A Javascript code with more than three levels of nested functions, should be restructures to make it as efficient as possible so that the fellow developers do not find it difficult to read and understand. Below is an example that showcases nested functions.

    • <script>
    • Konfinity1 (a,b){
    • Konfinity2{
    • Konfinity3{
    • //this is too complex and intricate to follow and can likely be solved another way
    • }
    • }
    • }
    • </script>
  6. DOM manipulations

    Accessing the DOM (Document Object Model) is important for getting the most out of your program and especially when it comes to complex programs. However, doing so repeatedly can cause visual clutter and might also slow down the program. A better option is to access it once and cache it for later use in a variable, this way you can access that variable instead of accessing the DOM again and again. You make the code visually cleaner and more efficient by accessing the variable in place of. Given below is an example. The DOM reference is marked with a ‘$’ symbol.

    • function accountInfo(){ var $accounts = $("#accounts");
    • var name = $students.find(".email").val();
    • var age = $students.find(".registrationNumber").val();
    • }
  7. Avoiding Global Variables

    In JavaScript, the scope of a variable decides where in your code can they be defined or accessed. Mainly, there are two type of variables, global and local. Global variables can be defined anywhere in the program and can be accessed outside of the function also, on the other hand, local variables ca only be accessed within the function it is defined.

    Also, in Javascript, if a local variable and a global variable share the same name, the local variable would be given priority. It is a good practice to avoid using global variables in your Javascript code as they can accidentally overwrite window variables and hence cause errors.

    A lot of global variables in the Javascript code might also slow down your program because unlike local variables which are deleted once the function is completed, global variables are not deleted until the window is closed. An example of local and global variable is given below.

    • <script>
    • var Var = "Konfnity global "; // global variable
    • function localVariable() {
    • var myVar = "Konfinity local"; // local variable
    • </script>
  8. Utilising Shorthand Notation

    It is a good practice to us shorthand notation when designing objects or arrays in JavaScript. Set the properties or cells of an object or array during declaration rather than setting it afterwards. The sole purpose of using shorthand notation is to save time in identifying which object or array you’re setting for on each line. This may look like a small, unnecessary change, but it really saves you and your team from eye strain when the objects and arrays are more complex. There is an example below which differentiates between longhand and shorthand object.

    • var courses = new Object();
    • //longhand object
    • courses.name = 'Web Development';
    • courses.totalhours = '150';
    • courses.students = 100;
    • //shorthand object
    • var computer = {
    • name: 'black';
    • totalhours: 'Dell';
    • students: 1200;
    • }
    • // Shorthand Array:
    • var coursenames = [
    • 'Web Development',
    • 'Front End Development']
  9. Using Strict Mode

    JavaScript is good at getting code to run without throwing errors. This feature can lead to silent errors that. They are passed without correction which is not desired for the execution of the code. To save yourselves for silent errors, opt into Strict Mode. Opting strict mode, silent errors that would previously make it past the compiler now throw errors. It allows you to fine-tune your code. Add the line 'use strict'; either at the top of your script section or before the desired function to opt in strict mode for the particular Javascript code.

  10. Setting default values

    Setting default values while creating objects ensures that the values of each attribute are not undefined and also demonstrates what type of data is expected to be used for that attribute. It is a good practice to set default values also so that it is easier for the team members to understand your code. The example below demonstrates the use of default values.

    • function student({
    • course = 'Web Development',
    • Name = 'Amit',
    • Placement = 600000,
    • })

The list above consisted of ten useful Javascript tips and tricks that are going to help you write clean, crisp and efficient code as a developer. When it comes to developing real time applications and development, learning how to code is necessary but never sufficient. You should also know how to be efficient while writing a code because the application you produce will be used by millions of people across the world. Another reason to write clean code is that your piece of code will be accessed by other coders and programmers also. We hope that this list of useful Javascript tips and tricks would make you a more proficient Javascript developer.

If you want to learn Javascript and other pivotal languages for developing websites and web applications, we suggest a professional course for you. It’s important that you are trained by some of the best developers from the industry itself so that you inculcate skills and make projects that helps you grab your dream job in some of the best companies in the industry.

One such course we would like to suggest is Konfinity ‘s Web Development Course which is developed by experts from IIT DELHI in collaboration with tech companies like Google, Amazon and Microsoft. It is trusted by students and graduates from IIT, DTU, NIT, Amity, DU and more.

Join the course to master the art of creating web applications by learning the latest technologies, right from basic HTML to advanced and dynamic websites, in just a span of a few months.

Konfinity is a great platform that helps you launch a lucrative tech career. We will get you started by helping you get placed in a high paying job. You know what’s amazing - no prior coding experience is required to take up our courses. Start your free trial here.