The 10 Most Common Mistakes JavaScript Developers Make

Today, JavaScript is like the backbone of software industries. You can find lots of JavaScript developers, from beginners to highly experienced. Once in a while, beginners or experienced make some common mistakes that ruin the code. The errors can be in the front-end or back-end. It directly impacts the time, cost and reputation.

Common mistakes in JavaScript development restricts the growth of developers, too, because they will not be successful to write code for the first time. If you are from a business, and want to make an application, you can hire top JavaScript developers.

In this article, we will see the top common mistakes Java developers make. So, here are the top 10 mistakes:

1. Semicolons Restrict Performance
2. ‘’==’’ Vs ‘’=’’ Operators
3. DOM
4. ‘’Strict Mode’’ Not Well Versed
5. Multipurpose of ‘’+’’ symbol
6. Using wrong indexes instead of integer indexes
7. Memory leaks
8. Wrongly used ‘’this’’
9. Mistakes in using default values
10. No proper naming in variables
11. Semicolons Restricts Performance

Not only beginners but expert developers make this mistake too. Expert developers use semicolons to make code readable. Beginners take it as negative. Beginners think that semicolons consume more memory and slow performance. So beginners use commas instead of semicolons.

There are studies about semicolons that don’t consume memory or slow the performance of apps. But it is useful to make code readable. So, beginners have to learn about it.

1. ‘’==’’ Vs ‘’=’’ Operators

Developers should learn the difference between ‘’==’’ and ‘’=’’ operators. Developers generally confuse between them.

• To add value or assign value, ‘’=’’ is used
• To compare the value of a variable, ‘’==’’ is used.

2. DOM

Influencing the DOM is easy in JavaScript. But many developers are insufficient in manipulating it. In some situations, developers will have to add multiple components at one time. But this process will take time, and developers are insufficient in it. The solution is to use document fragments to boost performance and save time. If you are stuck somewhere and want a proper answer? You can hire top JavaScript developers.

2. ‘’Strict Mode’’ Not Well Versed

‘’Strict mode’’ is used to restrict error handling and make it more secure. ‘’Strict mode’’ generally used by adding [‘use strict’ ;] at the beginning of the source. There are some good benefits of using it, but beginners overlook typically it and don’t use it perfectly.

3. Multipurpose Of ‘’+’’ Symbol

The ‘’+’’ symbol is used to add variables and to merge strings. But beginners generally don’t know its multi purposes and use it accidently and make code unusable and unstable. It directly affects overall production and time.

4. Using Wrong Indexes Instead Of Integer Indexes

It is required to define array objects with number integers indexes, but many developers use the wrong indexes in the number integer index. So, the outcome will be unexpected. Always use numeric integer indexes.

5. Memory Leaks

Memory leaks generally occur with all developers. To prevent memory leaks, coders have to make their skills tougher. Sometimes, punctuation mistakes lead to a whole data leak unknowingly, and it causes troubles in the next development.

Generally, objects are in memory to be accessible by roots through a string of references. To clean it, use GC (garbage collector) to remove the things from memory if unused only. But the catch is GC doesn’t clean some objects, but those are not used at all.

6. Wrongly Used ‘’this’’

‘’this ‘’ is a mostly misunderstood concept by JavaScript developers. Most developers don’t know more about ‘’this’’, and they create problems.

In the above code, you can see that the first result is JavaScript; the second result is ‘’undefined’’ because ‘’this’’ has no reference. It is happening because ‘’this’’ depends on the object calling.

If you write code like above, you can see that both answers are ‘’JavaScript’’ and ‘’JavaScript. ‘’

7. Mistakes In Using Default Values

It is always recommendable to use default values rather than customized values to protect code from errors.

If you write code like above, you can see that results will be ‘’nan’’ because ‘’a’’ and ‘’b’’ values are not defined. Adding values of ‘’a’’ and ‘’b’’ will make good results.

You can add ‘’a’’ and ‘’b’’ values like the above code so that the results will be zero. Never forget to add values; otherwise, the result will be ‘’nan’’.

8. No Proper Naming In Variables

Without proper naming, the JavaScript code can not work. Developers always make mistakes by naming variables incorrectly.

You can see above that everything is added correctly except ‘’a’’; developers often add only initials rather than adding full names.

Now, you can see that the ‘’amount’’ is properly used.

Conclusion

There are lots of other common mistakes developers make in development. Most of them are easily correctable, but most of them need rewriting code. If you have gone through the above article, you can easily solve some problems. If you are still confused about JavaScript development errors, you can hire top JavaScript developers from us. We at latitude Technolabs have expert JavaScript developers who are ready to take the challenge of your project.