Why Do Top JavaScript Libraries Use void 0 Instead of undefined?

This article explains the historical reason why JavaScript's undefined is not a keyword, how the void operator reliably returns undefined, and why high‑quality libraries prefer the concise void 0 syntax for safety and minification.

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Why Do Top JavaScript Libraries Use void 0 Instead of undefined?

Rare Earth Juejin Tech Community

Oct 12, 2021 · Frontend Development

The Dark Side of JavaScript: Three Features You Should Avoid Using

JavaScript, despite its evolution and flexibility, still retains three outdated features—void operator, with statement, and labels—that remain functional but are inefficient or confusing, and developers are advised to avoid using them in modern code to maintain readability and prevent bugs.

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The Dark Side of JavaScript: Three Features You Should Avoid Using