1. Not declaring variables.
When a variable is not declared, it is considered a global variable. This means that it can be accessed from anywhere in the code, which can lead to confusion and errors. To avoid this mistake, always declare variables using the
var keyword. For example:
var myVar = 1;
2. Using global variables.
As mentioned above, global variables can be accessed from anywhere in the code, which can lead to confusion and errors. It is best to avoid using global variables whenever possible. If you do need to use a global variable, make sure to give it a descriptive name so that you know what it is used for.
3. Not using strict mode.
"use strict"; statement at the top of your code. For example:
4. Not handling errors properly.
5. Using synchronous functions in an asynchronous context.
Synchronous functions are functions that block the execution of the code until they are finished. Asynchronous functions, on the other hand, do not block the execution of the code. It is important to use the correct type of function in the correct context. For example, you should not use a synchronous function in an asynchronous context, such as an event handler.
6. Not using the right data types.
7. Not using comments.
Comments are a great way to explain what your code is doing. They can also be used to disable code temporarily.
8. Not using indentation.
Indentation makes your code more readable. It is a good practice to use indentation consistently.
9. Not testing your code.
It is important to test your code regularly to make sure that it is working correctly. There are a variety of tools available to help you test your code.
10. Not learning from your mistakes.
Everyone makes mistakes when they are coding. The important thing is to learn from your mistakes and avoid making them again.
- Use a linter. A linter is a tool that can help you find potential errors in your code.
- Ask for help. If you are stuck on something, don’t be afraid to ask for help from a more experienced developer.