JavaScript Essentials for Freelance Web Developers
This guide explores JavaScript essentials for freelance web developers. It covers fundamental concepts, practical examples, and tips for mastering JavaScript.
Articles
Front‑End Development, page 21 of 26
Front‑end development is where product intent becomes the interface people actually use. My writing approaches it as engineering rather than surface decoration, with attention to browser behaviour and code that remains accessible, fast, and safe for a team to change.
JavaScript Essentials for Freelance Web Developers. 
React Unknown DOM Props: Why Component Props Reach the HTML. React Unknown DOM Props: Why Component Props Reach the HTML
React 16 passes unknown attributes to the DOM. See how component‑only props leak through JSX spreads, what React 15 did, and how to consume them.
Some of the Most‑Misunderstood Properties in CSS. Some of the Most‑Misunderstood Properties in CSS
Whilst understanding any computing language comes with practice and exposure, there are some areas of CSS that can flummox even the most seasoned of developers.
Improving Scroll Performance with Passive Event Listeners. Improving Scroll Performance with Passive Event Listeners
Use passive event listeners safely: learn when touch and wheel handlers block scrolling, when preventDefault() is required, and why handler cost is separate.
::Before and ::after Pseudo‑Elements in CSS. ::beforeand::afterPseudo‑Elements in CSSUsing the
:beforeand:afterpseudo‑elements in CSS for styling and content insertion. Here, I cover syntax, practical examples, and best practices.
Accessibility vs. Usability: What’s the Difference? Accessibility vs. Usability: What's the Difference?
Accessibility and usability overlap, but need different evidence. How to combine standards, research with disabled people, and checks of the complete task.
Understanding the Critical Rendering Path. Understanding the Critical Rendering Path
Follow HTML, CSS, and JavaScript through the browser's critical rendering path, then find the resources delaying the first useful render.
Promise.all() vs. Promise.race() in JavaScript. Promise.all()vs.Promise.race()in JavaScriptPromise.all()vs.Promise.race()in JavaScript, with async examples, error behaviour, timeouts, practical use cases, and common mistakes in real code.
Generators in JavaScript: A Beginner's Guide. Generators in JavaScript: A Beginner's Guide
JavaScript generators explained for beginners, covering generator function syntax, yield, paused execution, iteration patterns, and where generators still help.
Building Polyfills for JavaScript Array and String Methods. Building Polyfills for JavaScript Array and String Methods
Polyfills replicate modern JavaScript methods for compatibility. Here, I explain polyfills and show how to build key examples in unsupported environments.
JavaScript Error Handling Patterns. JavaScript Error Handling Patterns
Error handling in JavaScript is vital for building robust applications. Here, I explore modern patterns like try‑catch, async/await, and global error handlers.
The CSS overflow Property. The CSS
overflowPropertyUnderstand the CSS overflow property, including visible, hidden, scroll, auto, x, and y control, scrollbars, accessibility, and mobile‑browser quirks.
The Difference Between JavaScript Callbacks and Promises. The Difference Between JavaScript Callbacks and Promises
JavaScript callbacks can run synchronously or later; promises represent one eventual result. I explain their differences, error handling and asynchronous flows.
Array.find(), Array.some(), and Array.every() in JavaScript. Array.find(),Array.some(), andArray.every()in JavaScriptArray.find(),Array.some(), andArray.every()in JavaScript explained clearly, including return values, use cases, and when each method fits best.
Understanding CSS Transitions. Understanding CSS Transitions
CSS transitions allow us to create smooth animations between states, enhancing user experience. Here, I discuss how to use transitions with practical examples.
Object.is() vs. Strict Equality in JavaScript. Object.is()vs. Strict Equality in JavaScriptCompare Object.is() and strict equality in JavaScript, including NaN, signed zero, loose equality contrast, and when precision matters in real code.
What is CORS and Why is My JavaScript fetch Blocked? What is CORS and Why is My JavaScript
fetchBlocked?CORS explained for JavaScript fetch errors, including same‑origin policy, server opt‑in, preflight requests, credentials, and what front‑end code can fix.
BEM and Sass for Component CSS. BEM and Sass for Component CSS
Use BEM and Sass together for component CSS with clear naming, shallow nesting, modifiers, reusable mixins, and less fragile front‑end styling over time.