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18. What is the value of the String referred to by the variable s after the following code executes? String fun = "bcd"; String a = ""; for (int i = 0; i < fun.length(); i++) { a = a + (char) (fun.charAt(i) + 3); String s = ""; for (int i = 0; i < a.length(); i++) { S = S + (char) (a.charAt(i) + 'A' -'a');

Getting this error message in Flutter The argument type 'String? Function(String)' can't be assigned to the parameter type 'String?)?'.

For the line listed below - 

if (inValue.length == 0)

How do I resolve it?

Which model of the software development process do you believe is the most sufficient and why?

Would you prefer a process that thinks out every step, plans along the way, and releases a final product OR a process that releases bit by bit to get feedback so you can just continuously make updates? Why?