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Snippet Library.

Advanced Date and Time Zone Conversions

Master converting dates and times between different time zones, extracting parts of dates, and calculating date differences in SQL.

Regex for Validating URLs

Master URL validation in JavaScript with a comprehensive regular expression to check for correct web address formats, including protocols, domains, and paths.

Extracting Hashtags from Text using Regex

Discover how to efficiently extract all hashtags (e.g., #topic, #example) from a given string in JavaScript using a simple regular expression and `match()`. Ideal for social media apps.

Stripping HTML Tags from a String with Regex

Securely remove all HTML tags from user-provided text in JavaScript using a regular expression to prevent XSS vulnerabilities and clean content for display.

Extracting URL Query Parameters with Regex

Learn to parse and extract individual query parameters and their values from a URL string in JavaScript using a regular expression, ideal for client-side routing and data handling.

Automate Directory Backup with Timestamp

Learn to create a robust Bash script for automating directory backups, appending a timestamp to each archive for easy versioning and recovery.

Check and Restart System Service with Bash

Implement a Bash script to monitor a critical system service like Nginx or MySQL, automatically restarting it if it's not running to maintain uptime.

Automate Deletion of Old Files

Learn to write a Bash script that efficiently finds and deletes files older than a specified number of days, perfect for log rotation or temporary file cleanup.

Calculating Total Order Value Per Customer

Learn to join multiple tables (customers, orders, order_items, products) and use aggregate functions like SUM to calculate total spending per customer.

Using CTEs for Multi-Step Data Analysis

Improve query readability and structure complex SQL logic using Common Table Expressions (CTEs) to first calculate daily sales and then find monthly averages.

Implementing Pagination in SQL Queries

Learn how to retrieve a specific range of rows from a large dataset, essential for displaying paginated results in web applications, using LIMIT and OFFSET.

Performing Upsert (Insert or Update) Operations

Learn to efficiently insert new records or update existing ones based on a unique key, preventing duplicates and ensuring data integrity with a single query.