Web Designing Theory – Learn React, Python, HTML, CSS & PHP

  Conditional Rendering in React Conditional Rendering is one of the most useful concepts in React. It means showing different content on the screen depending on a condition. For example: If a user is logged in → show Logout If a user is not logged in → show Login If a student has passed → show Congratulations If a product is available → show Buy Now If data is loading → show Loading... React does not have a separate if rendering tag. Instead, we use normal JavaScript conditions such as if, the ternary operator, &&, and switch to decide what should appear in the UI.

  React useState Hook: Complete Guide to State in React When you build a React application, you often need to store information that can change while the user is using the page. For example: A counter can increase or decrease. A button can change from Follow to Following. A form field can store the text entered by the user. A menu can open and close. A product quantity can increase or decrease. React uses state to handle this type of changing information. The useState Hook is one of the first React Hooks that every React developer should learn. It allows a functional component to create and manage its own state.