When npm install Fails with “Invalid Version”
Understanding package-lock.json, Hidden Traps, and How to Fix Them Properly
Mastering setTimeout and setInterval in JavaScript: The Complete Beginner’s Guide to Timers and Scheduling
When you first start learning JavaScript, you’ll eventually meet two functions that can feel mysterious: setTimeout() and setInterval().
Both are built-in JavaScript functions used to schedule when code should run — but they behave quite differently.
This guide will help you understand them deeply, with real-world explanations, best practices, and
ESLint: The Silent Guardian of Your JavaScript Code
If you’ve been writing JavaScript (or TypeScript) for a while, chances are you’ve heard of ESLint. For many developers, it’s something that just “runs in the background” and occasionally yells at you about missing semicolons or unused variables. But the truth is, ESLint plays a much bigger
Mastering JavaScript Concurrency: Promise.all vs Promise.allSettled
JavaScript is designed to handle asynchronous operations gracefully. Whether you are fetching data from APIs, reading files, or executing time-consuming computations, Promises give you a structured way to manage asynchronous results.
Two of the most commonly used Promise combinators are Promise.all and Promise.allSettled. At first glance, they may
Why instanceof is Not the Reliable Type Check You Think It Is
If you’ve been writing JavaScript long enough, you’ve probably reached for instanceof at some point. At first glance, it feels like a neat way to verify if an object is an Array, a Date, a custom class, or something else. Unfortunately, instanceof is one of those features that
Why instanceof Promise Is Not a Reliable Check in JavaScript
When working with asynchronous programming in JavaScript, it is tempting to check whether a value is a Promise using instanceof Promise. At first glance, this seems logical—after all, promises are the foundation of async/await, so why not verify them directly?
But here’s the catch: instanceof Promise is
Measuring Progress with Percentages in JavaScript: A Practical Guide
When building applications that track user progress—such as to-do lists, learning platforms, or project management dashboards—you’ll often need to calculate the percentage of tasks completed. This percentage provides a clear, user-friendly way to communicate progress at a glance.
Let’s break down the logic, explore how to