Oana Rinaldi – Page 2 – Art of Coding

‘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

Python

Rate Limiting an API Without Redis: A Simple In-Memory Python Solution

Rate Limiting an API Without Redis: A Simple In-Memory Python Solution Rate limiting is a common strategy to prevent abuse and ensure fair usage of APIs. In production environments,…

Oana Rinaldi October 22, 2025

Automation Scripts

“One Click Deploy”: Automate Static Site Publishing via GitHub Actions

"One Click Deploy": Automate Static Site Publishing via GitHub Actions Shipping your static website manually every time you make a change can become repetitive and error-prone. With GitHub Actions,…

Oana Rinaldi October 21, 2025