Forgetting to use React Fragments (<>…)
The Importance of React Fragments and How to Use Them Properly A common mistake in React development is forgetting to use Fragments when returning multiple elements, which leads to unnecessary….
Tag: React components
Invalid JSX error due to missing closing tag
Fixing Invalid JSX Errors from Missing Closing Tags JSX requires proper element closure, and missing closing tags are among the most common syntax errors in React components. Here’s how to….
Trying to set a state variable outside the component function
Trying to Set State Outside a React Component A common React mistake is attempting to modify state variables outside their component function. This violates React’s fundamental principles and will not….
Using state updates inside a loop without batching
A common React performance pitfall is making multiple state updates inside loops without proper batching, which can lead to: The Problem Why this is problematic: Correct Solutions 1. Single Batch….
Calling setState() with a function but not using previous state
A common React anti-pattern is using the functional form of setState() (or state setters in hooks) without actually utilizing the previous state parameter. This unnecessarily complicates code and can sometimes….
Passing an object in setState() without creating a new reference
A common React performance pitfall is passing objects to setState() (or state setters in functional components) without creating new references, which can lead to unexpected behavior and missed updates. The….
Mutating props inside a child component
A fundamental React anti-pattern is attempting to modify props directly within a child component. This violates React’s unidirectional data flow principle and can lead to unpredictable behavior. The Problem Why….
Passing a function instead of calling it in event handlers (onClick={handleClick()} instead of onClick={handleClick})
Passing vs. Calling Functions in Event Handlers A common React mistake is accidentally calling a function immediately instead of passing it as an event handler callback. This can cause unexpected….
Assigning a variable inside JSX without using curly braces
A common mistake in React is trying to assign or declare variables directly within JSX without using the proper JavaScript expression syntax (curly braces {}). The Problem Correct Solutions 1…..
Forgetting to import React when using JSX (React 17+ solves this)
Forgetting to Import React in JSX The Classic Error Before React 17, you’d encounter this error when forgetting to import React: React 17+ Automatic Runtime Good news: Since React 17….