JSW One Platforms Interview Questions and Answers

Val is immutable and var is mutable in Kotlin programming language.

• Val is used to declare a variable whose value cannot be changed once assigned.

• Var is used to declare a variable whose value can be changed.

• Val is similar to final variable in Java.

• Var is similar to non-final variable in Java.

• Val is preferred over var as it ensures immutability and reduces the chances of bugs.

• Example: val name = "John" // value cannot be changed later, var age = 25 // value can be changed later

I follow the MVC (Model-View-Controller) design pattern in my iOS development.

• Separates data (Model), user interface (View), and control logic (Controller)

• Improves code organization and maintainability

• Promotes reusability and scalability

• Examples: UIKit framework in iOS uses MVC pattern

Yes, I have worked on MVVM architecture pattern.

• MVVM stands for Model-View-ViewModel.

• It separates the UI logic from the business logic.

• ViewModel acts as a mediator between Model and View.

• Data binding is a key feature of MVVM.

• I have implemented MVVM in my previous Android projects using Android Architecture Components such as LiveData and ViewModel.

Broadcast Receiver is a component of Android system that listens to system-wide broadcast announcements.

• It is used to respond to system-wide broadcast announcements.

• It is implemented as a subclass of BroadcastReceiver class.

• It can be registered either statically in AndroidManifest.xml or dynamically in code.

• Examples of system-wide broadcasts are battery low, network connectivity changes, etc.

Closures are self-contained blocks of functionality that can be passed around and used in your code.

• Closures capture and store references to any constants and variables from the context in which they are defined.

• There are three types of closures: Global functions, Nested functions, and Closure expressions.

• Closure expressions are unnamed closures written in a lightweight syntax that can capture values from their surrounding context.