Math series: Distance between 2 points

distance.swift

// Pythagorean theorem
// √(x1 - x2)2 + (y1 - y2)2
//
extension CGPoint {
    func distance(from point: CGPoint) -> CGFloat {
        let xDist = point.x - x
        let yDist = point.y - y
        return sqrt((xDist * xDist) + (yDist * yDist))
    }
}

// or calculating the hypotenuse

extension CGPoint {
    func distance(from point: CGPoint) -> CGFloat {
        return hypot(x - point.x, y - point.y)
    }
}

// usage
let distance: CGFloat = pointA.distance(from: pointB)