What are the three errors in JavaScript?
Hey Rebecca,
The three errors in JavaScript:
- SyntaxError: This occurs when there’s a mistake in the code structure.
- ReferenceError: This happens when trying to use an undeclared variable.
- TypeError: Arises when an operation is performed on an inappropriate data type.
To know more details about the other common JavaScript Errors, follow this guide shared below and learn how to handle them.
There are other most commonly found errors in JS that are
Runtime Errors: Runtime errors occur during the execution of a script. These can include issues such as referencing an undefined variable, calling a function that does not exist, or attempting to perform an operation on incompatible data types. Runtime errors can cause the script to stop executing and may require debugging to identify and fix.
Logic Errors: Logic errors, also known as semantic errors, occur when the code does not behave as intended due to a mistake in the logic of the script. These errors can be challenging to identify because the script will still run without throwing an error, but the output or behavior will be incorrect. Logic errors often require careful examination of the code to find and correct.
Network Errors: These occur when there are issues with network requests made by JavaScript, such as failure to connect to a server, timeouts, or issues with the response. Network errors can occur due to various reasons, including server-side problems, network connectivity issues, or incorrect handling of requests and responses in the JavaScript code.
JS errors don’t always have to be technical. Some errors are also not technically related but do consume time by tracing back to the error and finding the root cause.
Callback Hell: While not technically an error, callback hell is a common issue in asynchronous JavaScript programming. It occurs when multiple nested callbacks are used, leading to code that is difficult to read, maintain, and debug. Callback hell can be mitigated using promises, async/await, or other techniques for managing asynchronous code flow.
Security Errors: Security errors occur when JavaScript code attempts to perform an operation that is not allowed due to security restrictions. For example, attempting to access a resource from a different origin (Cross-Origin Resource Sharing or CORS), accessing the user’s clipboard without permission, or executing eval() with code containing potentially harmful content can result in security errors.
Memory Leaks: Memory leaks happen when a JavaScript application allocates memory but fails to release it, leading to a gradual increase in memory usage over time. This can eventually cause the application to slow down or crash. Memory leaks are often caused by improper management of object references, such as holding onto references that are no longer needed.