Error Handling in JavaScript

JavaScript is everywhere. Millions of webpages are built on JavaScript. Error handling is a critical aspect of JavaScript programming.

JavaScript Errors

JavaScript error happens when something unexpected takes place while your code is running.

Some common JavaScript errors are:

• Syntax Error: This occurs when your code violates JavaScript's syntax rule.
• Reference Error: When you try to access a variable or function that doesn't exists.
• Type Error: It shows up when you perform an operation on incompatible data types.
• Range Error: If a value falls outside the allowable range, this error is triggered.
• Custom Error: JavaScript allows you to create your own custom error.

Try-Catch Statement

By wrapping a block of code in a try block and catching potential errors in the catch block, you can prevent your program from crashing when an error occurs.

Catching specific error

Besides the generic catch block, you can catch specific types of errors by using multiple catch blocks.

The Finally Block

The finally block is incredible useful as it gets executed regardless of whether an error occurs or not. It's commonly used to perform cleanup operations or release resources.

Throwing Custom Errors

JavaScript allows you to create your own custom errors by extending the error object. This empowers you to define your own error types and provides more meaningful error messages to aid in debugging.

Defensive Coding

While error handling is crucial, practicing defensive coding techniques and error prevention is equally important.

This involves validating user input, checking for null or undefined values, and implementing error checks to handle potential edge cases.

By incorporating defensive coding practices, you can minimize the occurrence of errors and enhance overall stability of your coding.