JavaScript

Nov 25, 2025 · Fundamentals

Why === Isn’t Enough: Mastering Precise Equality with Object.is() in JavaScript

While the strict equality operator (===) works well for most cases, it fails with special values like NaN and distinguishes +0 and -0 incorrectly; JavaScript’s Object.is() method provides a more precise same‑value equality, correctly handling these edge cases and improving comparisons in Maps, Sets, and other structures.