Oana Rinaldi – Page 6 – Art of Coding

Sort Large CSV Files by Column Without Loading into Memory (Bash + awk)

Sort Large CSV Files by Column Without Loading into Memory (Bash + awk) Handling large CSV files that don’t fit into memory can be a challenge, especially when we…

Oana Rinaldi November 1, 2025

JavaScript

Monitor Website Uptime With Node.js and Discord Alerts

Monitor Website Uptime With Node.js and Discord Alerts Ensuring your website stays up and available is a critical part of maintaining a reliable user experience. While there are many…

Oana Rinaldi October 31, 2025

SQL

‘SELECT *’ is Lazy—Write Safer Dynamic Queries in SQL Using Parameters

'SELECT *' is Lazy—Write Safer Dynamic Queries in SQL Using Parameters One of the most common mistakes developers make when working with SQL is using SELECT * indiscriminately and…

Oana Rinaldi October 30, 2025

JavaScript

Implement Dijkstra’s Algorithm in JavaScript for Route Planning

Implement Dijkstra’s Algorithm in JavaScript for Route Planning Dijkstra’s algorithm is a cornerstone in graph theory that helps find the shortest path between nodes in a graph. Whether you're…

Oana Rinaldi October 29, 2025

JavaScript

Real-Time Form Validation in Vanilla JavaScript

Real-Time Form Validation in Vanilla JavaScript Form validation is a fundamental part of building user-friendly and secure web applications. While libraries like jQuery used to be the go-to solution,…

Oana Rinaldi October 28, 2025

Shell / Bash

Build a Bash Script to Monitor Disk Usage and Send Alerts

Build a Bash Script to Monitor Disk Usage and Send Alerts System administrators and DevOps engineers often need an efficient way to monitor disk usage across servers. Manual checking…

Oana Rinaldi October 27, 2025

SQL

SQL Window Functions Demystified with Real Sales Data

SQL Window Functions Demystified with Real Sales Data SQL window functions are an underrated powerhouse for data manipulation, especially in analytics and reporting. When working with e-commerce data —…

Oana Rinaldi October 26, 2025

Python

Automate GitHub Issue Reporting with Python & REST APIs

Automate GitHub Issue Reporting with Python & REST APIs Manually reporting bugs on GitHub can interrupt development flow, especially when issues arise frequently or need to be captured quickly.…

Oana Rinaldi October 25, 2025

Java

Java Coding Exercise: Implement LRU Cache from Scratch with LinkedHashMap

Java Coding Exercise: Implement LRU Cache from Scratch with LinkedHashMap Building an efficient in-memory cache is a common task in software systems, especially when performance and memory usage are…

Oana Rinaldi October 24, 2025

JavaScript

Secure Web APIs with Token-Based Auth Using Node.js and Express

Secure Web APIs with Token-Based Auth Using Node.js and Express In the modern web development landscape, securing APIs is crucial for maintaining trust and protecting sensitive user data. One…

Oana Rinaldi October 23, 2025