func findIndex<T>(of valueToFind: T, in array:[T]) -> Int? {
    for (index, value) in array.enumerated() {
        if value == valueToFind {
            return index
        }
    }
    return nil
}
// Binary operator '==' cannot be applied to two 'T' operands

let stringList = ["Python", "C++", "Swift", "Lisp", "Lua"]

if let result = findIndex(of: "Swift", in: stringList) {
    print(result)
}
else {
    print("Bulunamadi")
}