Inspectopedia
 
2024.3

Convert equality check with 'NaN' to 'isNaN' call

Warning
New
Last modified: 03 December 2024

Reports an equality check with Float.NaN or Double.NaN that should be replaced with an isNaN() check.

According to IEEE 754, equality check against NaN always returns false, even for NaN == NaN. Therefore, such a check is likely to be a mistake.

The quick-fix replaces comparison with isNaN() check that uses a different comparison technique and handles NaN values correctly.

Example:

After the fix is applied: