The Safest Way to Test for NaN in JavaScript
Why equality, typeof and global isNaN() are unreliable JavaScript NaN checks, and when Number.isNaN() provides a safer modern alternative in practice.
Articles, page 16 of 29
Articles from more than two decades of building, rebuilding, debugging, and leading web projects.
The Safest Way to Test for NaN in JavaScript. The Safest Way to Test for
When to Use var or let or const. When to Use
varorletorconstCompare var, let, and const in JavaScript, including scope, hoisting, reassignment, block behaviour, ES6 defaults, and when each declaration fits.
Local SEO is a Technical Problem Too. Local SEO is a Technical Problem Too
Local SEO is a technical problem too, covering crawlable content, structured pages, performance, metadata, internal links, and reliable local signals.
What is a Distributed Denial of Service (DDoS) Attack? What is a Distributed Denial of Service (DDoS) Attack?
Learn how DDoS attacks overwhelm services with distributed botnet traffic, why they are hard to block and which mitigations can reduce the risk.
Gatsby & GraphQL: Nodes vs. Edges. Gatsby & GraphQL: Nodes vs. Edges
Gatsby and GraphQL nodes versus edges explained through graph theory, query shape, pagination, and why Gatsby data often exposes both structures.
HTML Video and the preload Attribute. HTML Video and the
preloadAttributeUnderstand the HTML video preload attribute, including auto, metadata, none, browser behaviour, bandwidth cost, playback expectations, and trade‑offs.
Why You Should Not Use Protocol‑Relative URLs. Why You Should Not Use Protocol‑Relative URLs
Avoid protocol‑relative URLs on modern sites, with reasons around HTTPS, security, performance, browser expectations, and clearer absolute resource loading.
Can I Learn Front‑End Development in 2 Months? Can I Learn Front‑End Development in 2 Months?
Can you learn front‑end development in 2 months? Yes for fundamentals and small projects, no for mastery. Here is what eight focused weeks can realistically do.
Where to Find Jobs in Web Development. Where to Find Jobs in Web Development
Find web development jobs through job boards, aggregators, social networking, cold outreach, freelance routes, contract listings, and better search habits.
localStorage in JavaScript. localStoragein JavaScriptWith HTML5, new storage APIs became available that allow us to store small amounts of non‑essential data on the client‑side without needing cookies.
Detecting Breakpoints in React Using Chakra UI. Detecting Breakpoints in React Using Chakra UI
Use
useBreakpointValueandChakraProviderin Chakra UI 1.8 to respond to screen sizes in React, with custom breakpoints and server‑rendering caveats.
How to Improve Your Time to First Byte (TTFB). How to Improve Your Time to First Byte (TTFB)
Improve Time to First Byte by checking redirects, connections, cache hits, database queries, and origin work before deciding whether to add server capacity.
Optional Chaining in JavaScript (?.). Optional Chaining in JavaScript (
?.)Introduced as part of the ES2020 spec, JavaScript optional chaining takes some of the guesswork and convoluted if statement structuring out of accessing data.
Semantic HTML. Semantic HTML
Semantic HTML explained through meaningful elements, HTML5 structure, header, nav, footer, section, figure, accessibility, and more understandable markup.
Positioning in CSS. Positioning in CSS
Understand CSS positioning with static, relative, absolute, fixed, and sticky values, including containing blocks, layout effects, and common front‑end bugs.
Why is Time to First Byte (TTFB) Important? Why is Time to First Byte (TTFB) Important?
Time To First Byte (TTFB) is a measurement of the time it takes for a server to respond to a request: how quickly your visitor can start to load your page.
Automatically Submit Sitemaps to Google During Gatsby Build. Automatically Submit Sitemaps to Google During Gatsby Build
A historical Gatsby sitemap‑ping workflow, with a postscript explaining Google's retired endpoint and how to keep sitemaps discoverable.
Margin Collapse in CSS. Margin Collapse in CSS
Understand CSS margin collapse, including vertical margins, parent‑child behaviour, margin transference, why it feels odd, and how to prevent it.
Use CSS to Change the Mouse Cursor. Use CSS to Change the Mouse Cursor
Change the mouse cursor with CSS using built‑in cursor values or custom assets, whilst keeping interaction cues useful and avoiding distracting effects.
Exploring CSS Viewport Units Beyond vw and vh. Exploring CSS Viewport Units Beyond
vwandvhExplore CSS viewport units beyond vw and vh, including vmin, vmax, vi, vb, svh, lvh, and dvh for mobile browser chrome, writing modes, and sizing bugs.
Cleaning up Your JavaScript Code: The Double Bang (!!) Operator. Cleaning up Your JavaScript Code: The Double Bang (
!!) OperatorThe double bang operator turns values into explicit booleans, but it is not always the clearest option. Here's when it helps and when it does not.