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JAVASCRIPT Snippets.

Custom React Hook for Data Fetching with Loading and Error States

Implement a custom React hook, `useFetch`, to handle asynchronous data fetching, including managing loading and error states, making API calls cleaner and reusable.

Detect Clicks Outside an Element with useClickOutside React Hook

Build a `useClickOutside` React hook to detect when a user clicks anywhere outside a specific DOM element, ideal for closing modals, dropdowns, or popovers.

Lazy Loading with useIntersectionObserver React Hook

Implement a `useIntersectionObserver` React hook for efficient lazy loading of images or components, detecting when an element enters the viewport for performance optimization.

React to CSS Media Queries in JavaScript with useMediaQuery Hook

Create a `useMediaQuery` React hook to dynamically respond to CSS media query changes directly within your JavaScript components, enabling responsive logic.

Implement API Rate Limiting Retries with Exponential Backoff

Learn to robustly handle API rate limits (429 Too Many Requests) by implementing an exponential backoff and retry mechanism using JavaScript's Fetch API.

Upload Files to API using FormData with JavaScript Fetch

Demonstrate how to upload a file (e.g., an image) along with other form data to a REST API endpoint using the `FormData` object and Fetch API in JavaScript.

Validate Email Address

Validate email addresses with a robust JavaScript regex pattern, ensuring correct format for user input in web forms and applications.

Validate Strong Password

Enforce strong password policies using a JavaScript regex to check for minimum length, uppercase, lowercase, numbers, and special characters.

Sanitize Input: Remove Non-Alphanumeric Characters

Clean user input by removing all characters that are not letters or numbers, using a simple and effective JavaScript regex `replace` method.

Track Previous Value with `usePrevious` React Hook

Learn to create a custom React hook, `usePrevious`, to easily access the prior value of any state or prop, essential for comparisons and conditional logic in your components.

Debounce Any Value with `useDebounce` React Hook

Implement a generic `useDebounce` hook in React to delay updates of any value until a specified time has passed, optimizing performance for search inputs, resizing, and more.

Retrieve an Element's Computed CSS Styles

Learn to retrieve the final, calculated CSS styles of any DOM element, including styles from stylesheets, inline declarations, and user agents, using JavaScript's `window.getComputedStyle()`.