Surprising Behavior of Array.includes() vs indexOf() with NaN! #javascript

Strict Equality with indexOf():

Loose Equality with includes():
The includes() method, on the other hand, can correctly identify NaN in an array. It doesn’t rely on strict equality (===), so it can handle the quirks of NaN and return true if it finds it.

This is especially useful in data analysis or scientific applications where NaN may appear due to invalid calculations. Using includes() instead of indexOf() ensures that NaN won’t slip through the cracks unnoticed.

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