Why Cannot find 'newArray' in scope when using return outside of if statement

import Foundation

func aVeryBigSum(ar: [Int]) -> Int {

if ar[0] < ar[1]{

    var newArray = 1
    
} else if ar[0] > ar[1[]{
    var newArray = 0
}

return newArray

}

print(aVeryBigSum(ar: [5,8]))