The Persistent Perils: 5 JavaScript Mistakes Beginners (Still) Make in 2026 Alright, grab a coffee. We need to talk. It’s 2026. We've got async/await , Optional Chaining , Nullish Coalescing , Top-level await , even Stage 3 Record & Tuple proposals potentially landing soon. Our tooling is slick, frameworks are mature, and TypeScript has become the undisputed champion of type safety. Yet, I've found, working with teams both big and small, that some fundamental JavaScript mistakes still sneak into our codebases, causing disproportionate amounts of head-scratching and late-night debugging sessions. It’s easy to dismiss these as "beginner issues," but the truth is, they're more like foundational cracks. If left unaddressed, they can lead to flaky tests, unpredictable behavior, and architectural debt that grinds productivity to a halt. In my experience, even seasoned developers can sometimes overlook these subtleties when rushing to meet a deadline or diving into a new part of a large application.…