Loop (for each) over an array in JavaScript

The gap in what exists

While many resources exist, a concise, interactive, and well-explained modern guide might find a small niche among learners, but the gap for paid solutions is almost non-existent.

Wedge to win

New developers often search for clear, simple examples; a highly focused site with interactive demos could attract them, but they are unlikely to pay.

Reputation value (worth doing free for proof) — 25/100

Creating a highly-ranked, clear tutorial on a fundamental concept could slightly enhance visibility among junior developers, but its impact would be limited due to the crowded space.

Likely monetization

unclear

Incumbents to beat

MDN Web DocsW3SchoolsfreeCodeCampvarious coding blogs and YouTube tutorials

You are an expert JavaScript developer. Create a single-page interactive web application using Next.js 16 App Router, React 19, Tailwind v4, and hosted on Vercel, that clearly demonstrates various ways to loop over an array in JavaScript. The page should be titled 'JavaScript Array Iteration Methods'. For each method (e.g., `for` loop, `Array.prototype.forEach()`, `for...of`, `Array.prototype.map()`, `Array.prototype.filter()`, `Array.prototype.reduce()`), provide a distinct section. Each section must include: a brief explanation of the method's purpose and syntax, a clear code example that can be easily understood, and the expected output for the given example. Ensure the examples are concise and directly illustrate the iteration concept. Focus on readability and conciseness. The MVP should cover at least the 'for' loop, 'forEach', and 'for...of' methods. Provide all necessary code files including `page.tsx` and any Tailwind configuration. The build/verify gate is a deployed Next.js app on Vercel with these three methods clearly explained and demonstrated.