let / const / var — Hoisting, TDZ, Scope Pitfalls in Real Codebases
JavaScript skills for the React Developer (Frontend) career path. Filter, model, and reason about the real data this role works with every day.
JavaScript skills for the React Developer (Frontend)
this lesson focuses on the practical JavaScript toolkit a working React Developer (Frontend) reaches for on the job.
Try the first query
SELECT example, value
FROM javascript_dataset
WHERE priority = '1'
AND career = 'React Developer (Frontend)';
▸ preview · Sprint-2 will replace this with a live runner
Closures & this — Arrow vs Function, bind/call/apply, Event Handlers
Once this topic clicks, the recommended next step keeps the learning streak going on adjacent skills in the same career path.
continue path →Sprint-1 stub
This is the Sprint-1 stub for ai.careerplane.technology.react-developer.javascript.let-const-var.
The fully-generated topic page (sandbox + quiz + AI hints + interactive
tooling) lands in Sprint-2 at
(per arch/memo.md → D-2026-04-22-13). The
//go:embed all:static directive auto-serves
it on the next container rebuild — no server-code change needed.