6 Advanced JavaScript Questions That Separate Seniors from Mid-Levels
The article discusses advanced JavaScript questions that differentiate senior developers from mid-level ones. It covers concepts such as stale closures and the behavior of 'this' in different function contexts. Each question is accompanied by explanations and potential solutions to common pitfalls.
- ▪The first question addresses stale closure and primitive capture in JavaScript functions.
- ▪The second question explores how the 'this' keyword behaves differently in regular functions and arrow functions.
- ▪Both questions aim to test the understanding of closures, execution context, and variable binding.
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| Original publisher | DEV.to (Top) |
| Canonical URL | https://dev.to/vitalyobolensky/6-advanced-javascript-questions-that-separate-seniors-from-mid-levels-6cm |
| Publication time | Sat, 30 May 2026 18:42:14 +0000 |
| Retrieval time | 2026-05-30T18:59:44.194Z |
| Last seen | 2026-05-30T18:59:44.194Z |
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Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 895634) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Vitaly Obolensky Posted on May 30 6 Advanced JavaScript Questions That Separate Seniors from Mid-Levels #javascript #webdev #interview 1. Stale closure & primitive capture What is the output of the following code? function createIncrement() { let count = 0; const message = `Count is ${count}`; function increment() { count++; } function log() { console.log(message); } return { increment, log }; } const { increment, log } = createIncrement(); increment(); increment(); log(); Enter…
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