I am new to android app developing. My app with PayPal payment sandbox
In sandbox I have no return_url defined.
Please help me out of this PayPal API mess 😉

Assuming I have a data class like this

I have an interface ILoginExt with an extension function Login.logout(). This interface is implemented by the class LoginExt, and another class Login delegates ILoginExt to LoginExt. While I can call the logout extension function within the Login class, trying to call it from an instance of Login in the main function results in an “Unresolved reference: logout” error.

I am implementing Page Object Model for mobile application automation framework. For readability for each page I want to have 2 classes – Page itself having properties and basic functions only and Steps to have all other methods.
I want to create abstract class with some abstract methods and then force all classes that inherit from this class to have implementation only for these needed overridden methods, no more.

In C# I can create my own implicit conversion for my classes as follows…

I’m programming an app on android, using kotlin, I’m looking for a technology that allows data transmission between server and phone at high speed (maybe more than 200mb/1s), I used websocket, but it wasn’t very effective.

Is there any nice pattern to set an optional, nullable argument to a non-null default?

Given the discussion that took place : Click

If I have a function or constructor in Kotlin, how do I omit certain parameters with a conditional? For example:

If I have a function or constructor in Kotlin, how do I omit certain parameters with a conditional? For example: