Insertion sort in swift

insertionsort.swift

var array1 = [3,4,1,6,7,2,5,5]

for i in 1..<array1.count {
    
    let a = array1[i]
    var b = i-1
    
    while b >= 0  && array1[b] > a {
        array1[b+1] = array1[b]
        b -= 1
    }
    
    array1[b+1] = a
}

print(array1)