Duplicated parameter names
Understanding “Duplicated Parameter Names” in JavaScript 📌 Introduction In JavaScript, function parameters must have unique names. If you define a function with duplicate parameter names, it can lead to unexpected….
Tag: JavaScript console errors
Assignment to read-only global (e.g., undefined = 5)
Understanding “Assignment to Read-Only Global (e.g., undefined = 5)” in JavaScript 📌 Introduction In JavaScript, some global variables such as undefined, NaN, and Infinity are read-only, meaning they cannot be….
for…in iterating over prototype properties
Understanding for…in Iterating Over Prototype Properties in JavaScript 📌 Introduction JavaScript provides multiple ways to iterate over object properties, one of which is the for…in loop. However, a common mistake….
Using == to compare objects/arrays
Using == to Compare Objects/Arrays in JavaScript: A Comprehensive Guide 📌 Introduction JavaScript provides two main comparison operators: When dealing with objects and arrays, many developers mistakenly use == (or….
Array.map() not returning expected results
array.map() Not Returning Expected Results in JavaScript: A Comprehensive Guide 📌 Introduction The array.map() method is a powerful tool in JavaScript used for transforming arrays by applying a function to….
Shallow copies causing unintended mutations
Shallow Copies Causing Unintended Mutations in JavaScript: A Complete Guide 📌 Introduction In JavaScript, when working with objects and arrays, making a shallow copy instead of a deep copy can….
CORS errors in API requests
Understanding CORS Errors in API Requests (Cross-Origin Resource Sharing) Introduction CORS (Cross-Origin Resource Sharing) is a security feature implemented in web browsers to prevent malicious scripts from making unauthorized requests….
Failed to execute ‘append Child’ on ‘Node’
Understanding the Error: “Failed to execute ‘appendChild’ on ‘Node’” in JavaScript Introduction The error message “Failed to execute ‘appendChild’ on ‘Node’” occurs in JavaScript when the appendChild() method is used….
Event listeners not removed, causing memory leaks
Event Listeners Not Removed, Causing Memory Leaks – A Detailed Guide Introduction Memory leaks occur in JavaScript when objects that are no longer needed are still retained in memory, preventing….
Cannot access ‘[variable]’ before initialization
Understanding “Cannot access ‘[variable]’ before initialization” in JavaScript The “Cannot access ‘[variable]’ before initialization” error occurs in JavaScript when you attempt to use a variable before it has been initialized…..