Variables are declared using the keyword ‘var’ followed by the name of the variable. The value of the variable can then be assigned using the assignment operator ‘=’. Variables can be reassigned at any time, and can be used to store data that can be used throughout the script.
Debugging tools can also be used to identify performance issues in your code. By running your code through a debugger, you can identify areas where your code is running slowly and make changes to improve its performance. Additionally, debugging tools can be used to identify memory leaks, which can cause your code to run slowly or crash unexpectedly.
It’s also important to keep your code organized and readable. Use indentation and whitespace to make your code easier to read and understand. Additionally, use descriptive variable and function names to make your code more self-documenting. Finally, use comments to explain complex sections of code or to provide context for other developers.