Pattern: Comparing value to .nan constant
Issue: _
Instances of FloatingPoint (eg Float, Double, CGFloat, etc) should not be compared to a NaN using equal_to or not_equal_to operators. Doing so will result in unwanted or unpredicted behaviour, as comparisons using these operators will always return false and true, respectively.
Examples of correct code:
if myFloating.isNaN { ... }
if !myFloating.isNaN { ... }Examples of incorrect code:
if myFloating == .nan { ... } // Same as `if false`
if myFloating != .nan { ... } // Same as `if true`
if myFloating >= .nan { ... } // Same as `if false`
if myFloating < .nan { ... } // Same as `if false`