Best Tips To Improve Javascript Performance in 2020

JavaScript is one of the most popular scripting languages utilized by developers to develop mobile & web apps. Javascript is universal today and it helps to run websites, servers, robots, operating systems, games- you just need to name it! Javascript optimization is thus important to improve the efficiency of operations. 

Here are some ways that can help you to optimize your JavaScript and enhance the quality of the code.

Tips on How to Improve Javascript Performance

1. Using String Replace Function:

The String.replace() function allows you to substitute strings utilizing String & Regex. The replaceAll() method returns a new string with all matches of a pattern substituted by a replacement. It is also possible to explore other string methods. In short, this function helps to replace the string at its first occurrence.

2. Breakpoints & Debugging Points

With the aid of breakpoints or debugging points, it is possible to set up multiple barriers to amend sources of error at each barrier. Breakpoints are a much faster & hassle-free way that easily debugs your JavaScript code. The browser’s developer tools are launched instantly as soon as the code debugger statement is found and the bugs are mitigated.

3. Convert To Floating Number Without Compromising Performance

math.floor, math.ceil & math.round are often utilized to eliminate decimals. A better option is to use “~~” to phase out decimals for a value. This is basically a handy shorthand to save time to achieve functionalities such as Date(). It also helps to enhance the performance of micro-optimizations in a code.

4. Using Length To Empty An Array

To delete n elements in an array, start utilizing array.length. This technique helps in emptying & resizing an array.

5. Merging Arrays Without Server Load

If you want to merge two arrays, utilize Array.concat() function for small arrays and Array.push.apply() function for large arrays. Array.concat() function consumes a lot of memory during the creation of a new array if the arrays are large. Array.push.apply(arr1, arr2) will simply merge the second array to the first one and thus reduces memory usage.

6. Splice To Delete Array Elements

Using Splice optimizes the speed of the JS code and is always a better option than delete as it saves some “undefined/null” space in the code. The drawback of using delete is that it deletes the object property without updating the length of the array or reindexing it. This leaves behind undefined values.

7. Variable Caching

Caching the variable improves the overall JavaScript performance manifold. Each time you use the getElementsByClassName() or document.getElementById(), the Javascript has to repeatedly traverse through all elements on every similar element request. To boost the performance, cache the selections to a variable if it is utilized multiple times.

8. Utilize Switch Case

Switch cases can perform the same task as if/else statements. The advantage is that the switch case statements are evaluated only once in comparison to the if/else statements where an evaluation is necessary for each if that is present.

9. Use || operator For Default Values

In JavaScript, the basic rule is to have a default value to stop the process from halting at undefined values. You can use || to prevent this issue.

va

r a = a || ‘hello’

You should check if there are conflicting values that can be passed to the function to dodge bugs.

 10. Code Beautification

You can use jsbeautifier to beautify the code. It reformats a clumsy-looking code and presents it in a structured way.

Closing Thoughts

We have discussed some effective tips that can help you to optimize your Javascript and thus improve its performance. JavaScript performance is no doubt an important metric but it should be remembered that it must not be prioritized over detecting errors and functionalities should never be compromised. Happy coding!

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