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JAVASCRIPT Snippets.

Basic International Phone Number Validation

A JavaScript regex for validating common international phone number formats, supporting country codes and various separators, ideal for forms.

Extracting All Links and HREFs from HTML String

A JavaScript regex solution to parse an HTML string and extract all anchor (<a>) tags along with their href attributes, useful for web scraping or content analysis.

Syncing State with URL Query Params using useEffect

Learn how to synchronize React component state with URL query parameters. This snippet uses useEffect to read and update the URL, making component state bookmarkable and shareable.

Optimizing Performance with useMemo for Expensive Computations

Optimize your React components by memoizing expensive calculations using the `useMemo` hook. Prevent unnecessary re-renders and improve performance for computationally intensive tasks.

Advanced State Management with useReducer Hook

Learn to manage complex application state more predictably with React's `useReducer` hook. This snippet illustrates building a simple shopping cart with multiple actions (add, remove, update quantity).

Global Theme Management with useContext and Custom Hook

Implement a global theme switcher in React using `createContext` and `useContext`. This snippet shows how to create a custom `useTheme` hook for easy theme access and toggling across components.

Programmatic Media Control with useRef Hook

Learn to programmatically control HTML5 media elements like `<video>` or `<audio>` in React using the `useRef` hook. This snippet demonstrates playing, pausing, and resetting a video.

Making Authenticated API Requests with Bearer Token

Learn how to securely make API requests by including an Authorization Bearer token in the request headers using JavaScript's Fetch API.

Centralized Error Handling for API Responses

Implement robust, centralized error handling for your API calls using JavaScript's Fetch API, catching network issues and parsing HTTP status codes.

Client-Side Caching for API Responses

Improve web application performance and reduce API calls by implementing a simple client-side cache for API responses using JavaScript's Map object.

Paginating API Results with Offset and Limit

Learn to paginate API results effectively by appending `offset` and `limit` parameters to your requests using JavaScript's Fetch API for controlled data retrieval.

Dynamically Creating and Appending DOM Elements

Learn to programmatically create new HTML elements and efficiently append them to the DOM using JavaScript, enhancing dynamic content generation.