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Lessons (6)

• I — Interface Segregation Principle

  … one giant remote vs small remotes that each do one thing](/img/solid/isp-remotes.svg) 📘 ISP: "Clients …

• How a Web Request Works

  … the browser, the OS, your router and your ISP. mermaid flowchart LR B[Browser cache] -- miss O[OS …

• State Management (Redux, Zustand, TanStack Query)

  … 60 000, // treat data as fresh for 1 minute }); if (isPending) return <Spinner / ; if (error) return <ErrorMessage error …

• Arrays & Strings

  … palindrome? ("racecar" reads the same backwards) js function isPalindrome(text) { const s = text.toLowerCase().replace(/[^a-z0-9 …

• Meaningful Names

  … yes or no B[is / has / can<br/ isPaid, hasAccess] Q -- an action V[Verb + noun<br/ sendInvoice …

• Frontend Performance & Core Web Vitals

  … you type). jsx const [query, setQuery] = useState(""); const [isPending, startTransition] = useTransition(); function onChange(e) { setQuery(e.target.value …