Javascript

These JavaScript tutorials explain how the language really behaves. They focus on the parts that confuse people most.

Start with the event loop and callback queue. Then asynchronous JavaScript goes deeper. Also, the weird parts covers the odd cases.

13 articles

05/02/2025 2 min read

Instantly Edit Websites with Chrome designMode

Use Chrome document.designMode for temporary copy and layout mockups. Steps, limits, a11y warnings, and when to use DevTools overrides instead.
22/07/2024 7 min read

JavaScript in AI Development: Browser and Node Tutorials

Practical JavaScript AI tutorial: local embeddings in Node, browser image classification with Transformers.js, ONNX/WebGPU notes, and a ship…
10/10/2023 3 min read

Event Bubbling in JavaScript

Executive Summary: Nested DOM events fire on the target then climb parent nodes, which surprises teams who attach…
22/07/2023 3 min read

Concurrency & Parallelism in JavaScript

Executive Summary: JavaScript is single-threaded, so concurrency and parallelism get mixed up and UI freezes follow. I separate…
22/09/2022 4 min read

Mastering Asynchronous JavaScript & Event Loop

Executive Summary: Blocking the main thread on fetches and timers makes UIs feel stuck and unresponsive. I cover…
03/07/2022 3 min read

Inheritance And Prototype Chain in JavaScript

Introduction JavaScript has positioned itself as an integral part of web development, fueling both client-side and server-side operations.…
20/05/2022 2 min read

Find Images Missing Width Height Using JS in Chrome Console

Website optimization is critical in delivering a seamless user experience, especially as page load times and stability become…
26/04/2021 4 min read

Event Loop & Callback Queue

How the JavaScript event loop and callback queue work, and how to structure your code so the main…
29/01/2020 2 min read

Javascript: The Weird Parts

JavaScript runs nearly everywhere, but like any language it has quirks and weird parts that can cause confusion…
30/07/2019 1 min read

Get last element of Array in Javascript

You can always do it in the fastest way. If performance is a deal breaker for you where…
06/05/2016 5 min read

Get values from PHP to Javascript

When developing web applications, there are often times when you need to pass data from the server-side (PHP)…
23/12/2013 3 min read

Vanilla JavaScript Equivalent jQuery Tasks Replaced for Performance

Let’s be honest: jQuery has been a lifesaver. For years, it smoothed over the rough edges of cross-browser…
11/10/2013 3 min read

Structuring Your JavaScript Applications

As web applications become more complex, the way we structure our JavaScript code matters more than ever. If…