i have 3 Doubles, their values are random, and i am trying to achieve a comparison between them

so my code is

let double1 = 10.00 // notes: they're all random between 1-100 so i don't know what this will be
let double2 = 7.66
let double3 = 6.43

but, i tried

 if (double1?.isLess(than: 50.0))! {
            print("Low")
        } else {
            print("High")

        }

but as i mentioned, this can't be done due to the random values, i need to compare two of them to each other, to make sure that one of them will be higher