Oana Rinaldi – Page 4 – Art of Coding

Asynchronous File Uploads with JavaScript Fetch and Async/Await

Asynchronous File Uploads with JavaScript Fetch and Async/Await IntroductionUploading files without blocking the user interface is an essential part of modern web applications. With the power of JavaScript’s fetch…

Oana Rinaldi March 25, 2026

Shell / Bash

Monitor System Resources Automatically Using Bash + Cron

Monitor System Resources Automatically Using Bash + Cron IntroductionSystem performance monitoring is a fundamental maintenance routine every developer, sysadmin, or DevOps engineer should automate. Whether you're tracking CPU spikes,…

Oana Rinaldi March 24, 2026

SQL

SQL Query Optimization 101: Speed Up Your SELECTs

SQL Query Optimization 101: Speed Up Your SELECTs IntroductionEvery developer has faced it: a SQL query that takes forever to return results. Whether you’re dealing with large datasets, complex…

Oana Rinaldi March 23, 2026

Java

Java Streams Deep Dive: Processing Large Data Collections Efficiently

Java Streams Deep Dive: Processing Large Data Collections Efficiently IntroductionWhen working with massive collections of data in Java, performance and readability often come into conflict. The Java Stream API…

Oana Rinaldi March 22, 2026

DevOps / CLI Tools

Node.js Command Line Tools: Create Your Own JSON Formatter

Node.js Command Line Tools: Create Your Own JSON Formatter Overview: Command line tools are powerful, especially when they can automate tedious tasks like checking or formatting data files. In…

Oana Rinaldi March 21, 2026

JavaScript

Real-Time Form Validation in Vanilla JavaScript

Real-Time Form Validation in Vanilla JavaScript IntroductionForm validation is one of the most fundamental parts of building interactive web applications. While libraries like React or jQuery Validation can simplify…

Oana Rinaldi March 20, 2026

JavaScript

Use JavaScript to Detect and Optimize Slow Images on Your Website

Use JavaScript to Detect and Optimize Slow Images on Your Website IntroductionLarge, unoptimized images can harm your website’s performance and drive away visitors. By using JavaScript, we can programmatically…

Oana Rinaldi March 19, 2026

Python

Building a URL Shortener Service in Python Flask

Building a URL Shortener Service in Python Flask IntroductionWe’ve all used URL shorteners like Bitly or TinyURL — they take a long, messy URL and turn it into something…

Oana Rinaldi March 18, 2026

Shell / Bash

Bash + Cron = Hands-Free Database Backups

Bash + Cron = Hands-Free Database Backups OverviewRegular database backups are essential for data safety, but performing them manually is tedious and error-prone. Thankfully, with a simple Bash script…

Oana Rinaldi March 17, 2026

Python

Building a Simple Chatbot Using Python’s OpenAI API Wrapper

Building a Simple Chatbot Using Python’s OpenAI API Wrapper IntroductionBuilding chatbots with Python has become remarkably accessible thanks to OpenAI’s API and its official Python wrapper. In this guide,…

Oana Rinaldi March 16, 2026