React-React development guidance

Example

A navigation bar that is used across multiple pages of a website.

Scenario

In React, UI elements are created as components that can be reused in different parts of an application. For instance, a header or navigation bar component can be designed once and reused across multiple pages. This saves development time and ensures consistency. By separating components, developers can manage small sections of the UI without affecting the overall application structure.

Example

A user profile form where the input fields need to update dynamically as the user types.

Scenario

React components can maintain their internal state, which means that each component can remember data about itself. For example, when building a form where a user enters their name and email, React allows the form to 'remember' what the user has typed so far, and the UI automatically updates when the state changes. State management is crucial for building interactive applications like to-do apps or real-time chat apps, where the UI must react to user actions in real-time.

Example

Updating the displayed list of messages in a chat application without re-rendering the entire page.

Scenario

React’s Virtual DOM allows the UI to be updated efficiently by only changing the parts of the web page that need updating. For instance, if a new message is sent in a chat app, React will update only the specific message element, rather than re-rendering the entire chat window. This improves performance, especially in large-scale applications with frequent state changes or dynamic data.

Example

Passing user data from a parent component (like a dashboard) to child components (like individual user profiles).

Scenario

React follows a unidirectional data flow pattern, meaning data flows from parent components to child components via 'props'. This makes data management predictable, as the flow of information is one-way. In a project like a blog platform, a parent component might hold the state of the user's preferences, and child components (like individual blog posts) will receive these preferences as props, ensuring that each child component reacts to the same data changes in a consistent manner.

Example

Using the useState and useEffect hooks in a weather application to manage data and side effects.

Scenario

React hooks allow developers to manage state and side effects in functional components. The `useState` hook manages local component state (like user input), while the `useEffect` hook handles side effects like fetching data from an API. For instance, in a weather app, `useState` could manage the current temperature, and `useEffect` could trigger an API call to fetch the weather data whenever the component mounts or updates. This makes it easier to write logic in functional components and results in cleaner, more readable code.