10 More New Super Useful Tricks In JavaScript

Mansi Sharma
6 min readNov 16, 2023

Gone are the days when websites were built on static information and JavaScript has completely replaced all such websites by providing versatile dynamic practices. Catering, event management, custom rosters, SAAS tools, and learning management tools are the current trends. Fortunately, our experts have been successful and have gained a lot of experience in choosing the best tips to simplify aspects of development. Since the creation of JavaScript, we have gone through several stages of JS practices to get the most out of every product we offer. Therefore, this article aims to offer some of the most tried and tested JavaScript tips and tricks shared by our JS and MEAN-STACK experts.

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1. Combine Javascript modules and minify JS files.

Bundling your application components into separate Javascript *.js files and passing them through a JavaScript minifier simplifies your code. This creates the coding in a standardized format and makes it more readable for both the developers and the application.

Sometimes it is difficult to obtain a condensed version. coded. Read and understand the process in detail, but it will definitely make your coding easier and more efficient.

Also, a small font can reduce the file size, which will directly reduce your coding time. Remove line breaks, extra spaces, comments, etc.

Optimization is another type of JavaScript minification that does more than just remove spaces, commas, comments, etc. not necessary, but also deletes unused code blocks. Some of the most popular code minification tools/libraries are:

  • Google Closure Compiler
  • UglifyJS
  • Microsoft AJAX Minifier

All Any of them increase the size of a JavaScript file and affect page loading speed. Code compression/minimization solves these types of problems.

2. How to use scope (“this”) in JavaScript

Using a scope called “this” allows us to write asynchronous code with callbacks and also helps improve application performance by eliminating the dependency from global variables and reducing the degrees. Conversely, avoid the “with” keyword because it modifies the scope string, reducing application performance.

3. Asynchronous loading of external JS files

Asynchronous JavaScript loading is a type of synchronized loading. This means your site will load as multiple feeds. When the browser encounters the string containing , it stops creating DOM and CSSOM templates to execute JavaScript files. For this reason, most of the JavaScript code is placed after the main HTML code.

To avoid this delay, we can add an asynchronous tag to the JavaScript script tag so that the DOM template creation occurs. in parallel and does not interrupt the loading or execution of JavaScript files. When the browser detects a slow tag in JavaScript code, it does not stop loading the DOM or CSSOM templates.

All scripts with a slow tag are loaded immediately and after the DOM and CSSOM are executed. The download process is complete. Therefore, these scripts are also loaded in the same order we code them.

Follow this case if you want to load script tags asynchronously,

<script src="example.js" async></script>

And similarly follow this code if you want to use defer and

<script src="example.js" defer></script>

4. Remove unused components from JavaScript libraries

When using libraries like jQuery UI or jQuery Mobile, avoid using all possible components when we only need certain functions. Most libraries have options for managing the components included during download. It also makes websites load faster and improves the experience.

5. Use HTTP/2

HTTP/2 is the latest version of the HTTP protocol and brings significant improvements to improve JavaScript performance and help speed up site performance. HTTP/2 uses multiplexing and therefore allows multiple requests and responses to be sent simultaneously. The move to HTTPS will significantly help us take advantage of all the features of HTTP/2, including performance.

6. Use Javascript Content Delivery Network (Cdn) for faster dynamic loading

A CDN works by retrieving static resources from your website server and caching them on your servers. When a browser makes a request, the static content is served via the CDN and not the website. This is much faster than normal because CDN servers are globally distributed and act like a proxy server to determine which server is closest to the visitor.

  • CDN downloads files based on your region and distributes them to users.
  • Save bandwidth
  • Increase performance
  • Reduce processing costs of websites exist hosting services and are mostly available for free.

When a specific query is made, the server node closest to that user is determined dynamically. This optimizes speed based on the content that needs to be served to that user.

If we use Google CDN, it will also help us cache frequently accessed references in our application, saving the downloading multiple files. and increases the use of cached files. If we use local references, files will be downloaded for each reference.

7. Compress and decompress files in JS

JavaScript files can be very large. Use one of the zip applications like gzip to compress JavaScript and CSS files. Save bandwidth, reduce delays and latency, and improve overall application performance. Most servers and clients today support gzip. When a gzip-enabled browser requests a resource, the server compresses the response before sending it to the browser.

8. Use CSS3 in JAVASCRIPT

Most simple animations can be created using CSS or JavaScript, but the effort and time varies. Each has its pros and cons, but here are some good guidelines to follow:

Use CSS when managing smaller self-contained states for UI elements.

Use JavaScript when you need full control over your web animations. It helps us pause, pause, slow down or rewind.

Use requestAnimationFrame directly when you want to get the desired effect, a complete scene at your fingertips. This is useful when we create a game or draw on an HTML canvas.

CSS-based animations and web animations are supported natively and are usually handled by the “Composer thread”. It is fundamentally different from the browser “thread”, where styling, layout, painting, and JavaScript are done. Because when the browser performs some imperial tasks on the main thread, this composition thread can continue to perform animations without being interrupted.

9. Caching DOM Objects

When writing scripts, it is common for a script to repeatedly access some DOM objects. For example, note that the browser must dynamically get the document.images object twice per loop.

To get document.images

And to change the image source.

If we have 10 images, this corresponds to 20 calls, so (n*2) calls to the DOM images object.

<script type”text/javascript”>
for (var i = 0; i <document.images.length; i++) {
document.images[i].src=”image.gif”;
}
</script>

We can solve this problem by referencing the object being accessed repeatedly in a custom variable. Instead of using subsequent references to the object, we can use this variable. This improves application performance and reduces browser loading times. Now you can see in the following code that the call to document.images has literally been cut in half.

Here is the alternative method for “DOM object caching”.

<script type=”text/javascript”>
Var domImages = document.images;
For (var i=0; i<domImages.length’ i++)
domImages[i].src = “image.gif”;
</script>

10. Merge arrays in JavaScript to reduce memory consumption

If you want to merge two small arrays, use Array .concat() function

When using large arrays Array.push.apply(arr1, arr2)

var array1 = [“hai”, “welcome”];  
var array2 = [“good”, “morning”];
console.log(array1.concat(array2));
// [“hai”, “welcome”,“good”, “morning”];

The reason is usually to use Array.concat( ). Large tables consume a lot of memory. To get around this problem we can use Array.push.apply(arr1, arr2) which reduces memory usage and also ensures that the second array is merged with the first.

Example:

var array1 = [“hai”, “welcome”];  
var array2 = [“good”, “morning”];
console.log(array1.push.apply(array1,array2));
//[“hai”, “welcome”,“good”, “morning”];

It also optimizes the performance of your Javascript code, regardless of the size of an array.

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Mansi Sharma

Hi, I'm Mansi Sharma, B2B SaaS Front-End Developer with expertise in UX Prompt Design and DesignOps. https://lushaseex.com/4/6301786