CGFloat extension - saturate() and clamped smootherStep()

gistfile1.txt

extension CGFloat
{
    func saturate() -> CGFloat
    {
        return self < 0 ? 0 : self > 1 ? 1 : self
    }
    
    func smootherStep() -> CGFloat
    {
        let x = self.saturate()
        
        return ((x) * (x) * (x) * ((x) * ((x) * 6 - 15) + 10))
    }
}