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Track Previous State or Prop with `usePrevious`

Develop a `usePrevious` React hook to access the previous value of any state or prop, enabling comparisons and logic based on changes over time in your components.

Respond to CSS Media Queries with `useMediaQuery`

Build a `useMediaQuery` React hook to programmatically detect if a CSS media query matches, allowing dynamic component rendering and styling based on screen size.

Validate Email Address with Regex

Learn to validate email addresses using a robust regular expression in JavaScript to ensure correct format for user input.

Validate URL Format with Regex

Implement a JavaScript function to validate URLs, ensuring they follow standard protocols (http/https) and domain structures.

Validate Strong Password with Regex Criteria

Check password strength in JavaScript using regex to enforce requirements like uppercase, lowercase, numbers, special characters, and minimum length.

Extract Hashtags from Text String

Discover how to efficiently extract all hashtags from a given text string using a regular expression in JavaScript, perfect for social media features.

Remove HTML Tags from String Input

Sanitize user input by removing all HTML tags from a string using a regular expression, preventing potential cross-site scripting (XSS) vulnerabilities.

Group Associative Array by Key

Efficiently group an array of associative arrays into a new array where items are grouped under keys derived from a specified common field.

Flatten Multi-Dimensional Array

Convert a nested, multi-dimensional PHP array into a single-dimensional, flat array for easier iteration and processing.

Sort Associative Array by Key Value

Sort an array of associative arrays based on the values of a specific key (e.g., sorting a list of products by price or name) in ascending or descending order.

Recursively Merge Multiple Arrays

Combine multiple PHP arrays, including nested arrays, into a single array, prioritizing values from later arrays for common keys, useful for configuration.

Filter Array and Re-index Numerically

Filter elements from a PHP array based on a callback function and then re-index the resulting array numerically, useful for creating clean lists.