Top 5 JavaScript Mistakes That Developers Make

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The JavaScript language has a long history. There are a lot of developers out there who are still learning the basics. But, if you’re trying to learn the language and make your first steps into it, you need to know what mistakes new developers make.

You have already researched JavaScript development tutorials, and you know that it’s one of the most popular languages in the world. You’ve started to use it for your website or app, but there’s still something that feels wrong with it, isn’t it??

If you think so, this article is for you because you will know developers’ most common JavaScript mistakes when they code. Also, show how these JavaScript development mistakes can impact your code and how they can be fixed.

Mistakes By JavaScript Developers

JavaScript is the world’s most popular and widely used programming language, meaning you must learn many things to be an expert. One of the most common mistakes among JavaScript developers is making simple errors while writing code. Here are some of the most common ones:

1. Semicolons and Commas

Semicolons are used to separate statements in JavaScript but can also be used to separate function calls. When you use a semicolon, it must be placed at the end of a line. If you forget to place a semicolon, your program will not work correctly. Semicolons and commas are used to separate the different parts of a statement. This is important because JavaScript won’t run if there are unsanctioned semicolons or bad commas. However, when writing JavaScript, you can get away with many errors if you understand each part well.

2. Don’t Understand “Strict Mode.”

Your code must run in strict mode. This helps ensure that your code does what it should and doesn’t make any mistakes due to how variables are used or mistyped values. If you don’t understand how strict mode works, then make sure you get someone who does so they can help you understand how it works properly.

Faults will now be generated for code errors that would have been overlooked or failed quietly. A global variable with that name is automatically created when a value is assigned to an undeclared variable in strict mode. In strict mode, variables and functions declared inside an eval() statement are not generated in the scope of the statement they are declared in.

3. Incorrect Use of Function

A function should return a value based on its input parameters and not do anything else with those parameters. If a function does something other than return a value, then this function is called an impure function. An impure function can lead to unexpected results if it is used incorrectly or not documented correctly.

The problem is that the function is being called with the same parameters as before, but they are not being passed in correctly. The function expects a certain value but instead gets another value altogether. This can happen when there are multiple ways to pass a variable to a function, but one way is not used because it would make things more difficult than necessary or because another way is chosen for some reason.

4. Not Using Default Value

The default value is a value we assign to a variable when it does not have any value. It determines what the variable will hold if we do not assign any value to it. The default value is set by adding an underscore ( _ ) in front of the variable name and assigning its value as 0 or null. In this way, if we do not assign any value to a variable, then its default value remains as 0 or null.

It is a good habit to use default values when you don’t know what to put in the variable. It helps to avoid making mistakes while writing your code. For example, if you create a function and assign it to a variable with an empty value, you will not make a mistake. However, if you do not even use the default value, it may result in errors when you try to use it later.

5. Different Naming Variables

The naming of variables should follow the same pattern used throughout the program. This helps developers to understand what each variable is responsible for and how they interact with each other. If a variable has more than one purpose within your program, then it should be named so that it becomes easier to understand what each of them does.

How to Solve Common Mistakes in JavaScript

Here are some tips to solve common mistakes in JavaScript:

Practice More

 Mistakes are inevitable in any language. But, it is not always the case that you will be able to fix them immediately. To solve common mistakes in JavaScript, you need to understand the code better and practice more.

The best way to learn to code is by doing. This cannot be easy if you are a beginner, but there are many ways that you can practice your coding skills. Try to solve different problems and see if you can make them work. When you often get stuck on a problem, you must push yourself beyond your comfort zone to find the solution. If you are having trouble with a particular problem, try asking someone with experience solving similar problems to get some insight into what is going wrong.

Solve Different Problems

Sometimes, we will have a problem that has been solved before, but not by us. Try looking through other people’s code and seeing how they solved it before moving forward with your solution. The more you write code and the more problems you solve, the more experience you have with JavaScript and JavaScript Framework. If you have already solved some of them, practice some new ones. Try to debug your code when it doesn’t work as expected or when it has bugs.

This will help you understand the process of solving problems and may even inspire ideas for new types of problems that have not been considered before.

Try to Debug Your Code

Debugging is one of the most important skills required for a programmer as it helps you find bugs faster and fix them easily. The best way to debug your code is by using an online debugger such as Firebug or Chrome Developer Tools (if you’re using Google Chrome) which allows you to see what’s happening behind the scenes in your application at any time during the development process. Debugging your code is a main important skill of a JavaScript developer.

Understand the Functions

Understand the Functions when you write code; you should know what each function does and how it works. You may not always understand how a function works, but if you can’t figure out why something doesn’t work, it might be because you don’t understand what the function does or how it works.

Learn from Others You can learn from others who have already made mistakes when writing code and then fix them yourself. You can also use online forums for questions on how to solve certain problems in your daily work and tips on various languages used in JavaScript programming.


As a beginner, you will still improve with time, even if you make all the mistakes in this article. There are tons of resources for learning JavaScript; anything is possible if you put your mind to it. So whether you are fresh from school or experienced, never stop learning. Every company hires a JavaScript developer as soon as possible to remove the errors from your code and maintain professionalism.

These are the most common JavaScript mistakes developers have noticed in their work. These errors make the code messy, unorganized, and difficult to maintain. Try to implement these tips in your code to avoid these errors.

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