Most Common Javascript Errors & Fixes You Need To Know | How to Get Rid of Javascript Errors

Learn how to get rid of javascript errors and how to find errors in javascript. Here are most common javascript errors & fixes you need To know to become the best javascript developer. Learning about JavaScript errors is crucial for web developers because it helps to debug code more efficiently, improve code quality, enhance user experience, and optimize website or web application performance. By understanding common errors and how to handle them properly, you can write better code, resulting in a more responsive and functional website or application. In this video I will show you most common javascript errors and explain how to fix them and avoid them.

ReferenceError

A ReferenceError in JavaScript occurs when you try to access a variable or function that has not been defined. This can happen when you misspell the variable name, forget to declare it with var, let, or const, or try to access it outside of its scope. It is important to always declare your variables properly and keep track of their scope to avoid ReferenceErrors in your JavaScript code.

TypeError

TypeError occurs when you try to use a value that is not of the expected type. For example, calling a method on an undefined or null value.

SyntaxError

A SyntaxError in JavaScript occurs when you have a syntax mistake in your code, such as a missing semicolon, missing or misplaced symbol, missing bracket, missing keyword, expression or curly brace.

RangeError

A RangeError in JavaScript occurs when you try to use a value that is outside the allowable range of values. This can happen when you try to create an array with too many elements, or when you try to perform a mathematical operation that results in a value that is too large or too small.

EvalError

This error occurs when there is an error in the eval function. EvalError is a built-in error object in JavaScript that is thrown when an error occurs in the eval function. The eval function is used to evaluate a string of code as if it were part of the current script. This exception is not thrown by JavaScript anymore, however the EvalError object remains for compatibility.

URIError

URIError is thrown when a global URI handling function is used incorrectly. This error occurs when there is an error in the encodeURI, decodeURI, encodeURIComponent, or decodeURIComponent functions.

InternalError

An InternalError in JavaScript is a type of error that is thrown when an internal error occurs in the JavaScript engine. This error typically indicates a bug or limitation in the engine itself, rather than a mistake in the code written by the developer. Note that InternalError is a rare type of error and is often caused by bugs in the JavaScript engine or other low-level issues, rather than by mistakes in the code written by developers.

So these are most common javascript errors that you might see. It is important to understand these errors and how to fix them to avoid unexpected behavior in your JavaScript applications.

Now this is not all. There is a lot more to it.
If we take example of only 'ReferenceError'. There are more than just one type of 'Reference Errors'.
Such as:
It could be a variable that is not defined
It could be assignment to an undeclared variable
It could be lexical declaration access issue before initialization
It could be a depricated caller or argumnts usage issue
It could be reference to undefined property
and more.

If you like me to go deeper in this topic and explore more on javascript error types, then let me know in comments, or like this video to show that you want to learn more about javascript errors. I will expand this topic and will share a lot more regarding each error type.

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