React js core concepts скачать в хорошем качестве

React js core concepts

Here's a breakdown of the key concepts discussed: Components (0:47-1:11): React applications are built using self-contained, reusable blocks of code called components, similar to custom HTML tags with enhanced functionality. Props vs. State (1:34-2:07): State (1:51-1:56): Represents a component's internal memory and is mutable, meaning it can change over time. It's managed within the component itself. Props (1:57-2:01): Are like instructions or data passed down from a parent component to a child component. They are read-only and cannot be changed by the child component. `useState` Hook (2:41-3:11): Introduced in React 16.8, the `useState` hook allows functional components to manage their own state, providing a way to "hook into React state management features." Syntax Breakdown (3:49-4:12): The `useState` hook returns an array with two elements: the state variable (e.g., `count`) and a setter function (e.g., `setCount`) to update the state. The initial value is passed as an argument to `useState`. Prop Drilling (4:26-5:09): This is a common issue where data needs to be passed down through multiple layers of components as props, even if the intermediate components don't need that data. This can lead to cluttered and hard-to-refactor code. Solutions to Prop Drilling (5:11-5:35): Lifting State Up (5:21-5:59): The primary solution for sharing state between closely related components. It involves moving the shared state to their closest common parent, which then passes the state down as props to the children who need it. This keeps data flow explicit. Context API (6:27-7:01): A powerful built-in React feature that acts like a "data teleporter." It allows components to consume data directly from a provider at the top of the component tree, bypassing intermediate components. This is ideal for global data like themes, user data, or language settings. Decision-Making Guide for State Management (7:03-7:25): 1. Local State: Start by keeping state local within the component that needs it using `useState`. 2. Lift State Up: If sibling components need to share data, lift the state up to their closest common parent. 3. Context API: Only use the Context API when prop drilling becomes a significant problem, involving passing props through multiple unnecessary layers #reactjs #react #coding #frontendcourse #webdevelopment #webdesign