The delay() function is a coroutine-friendly way to pause execution without blocking the thread, allowing other coroutines to run.

launch

{

println("Starting coroutine")

delay(1000)

println("Delayed message")

}

Coroutines in Kotlin are a powerful way to handle asynchronous and concurrent programming efficiently. They allow you to perform background tasks without blocking the main thread.

import kotlinx.coroutines.*

fun main() = runBlocking

{

launch

{

println("Running a coroutine")

}

}

The by keyword is used for delegation in Kotlin. For example, with by lazy, initialization of a property is deferred until it is first accessed.

In Kotlin, == checks for structural equality (equivalent content), while === checks for reference equality (whether both references point to the same object).

The Elvis operator (?:) provides a default value when the left-hand expression evaluates to null, e.g., val result = value ?: "Default".

Boolean values are represented using true or false in Kotlin. Kotlin does not represent Boolean as 0/1 or Yes/No or Right/Wrong or Correct/Incorrect etc. So, Correct answer is false.

In Kotlin, the listOf function is used to create an immutable list. For example, val myList = listOf("A", "B", "C") creates a list that cannot be modified.

The forEach() function in Kotlin is used to iterate over a collection or array and execute a block of code for each element.

Lambda expressions in Kotlin are defined using curly braces {}. The syntax includes parameters, followed by ->, and then the body of the lambda, e.g., { x, y -> x + y }.

A sealed class in Kotlin restricts inheritance to a defined set of subclasses, making it useful for representing restricted hierarchies and exhaustive when expressions.

In Kotlin, you use the $symbol to interpolate a variable into a string. For example, "Hello,$name" replaces $name with the value of the name variable.

A data class in Kotlin is designed to hold data. It automatically provides methods like toString(), equals(), hashCode(), and copy(), reducing boilerplate code.

In Kotlin, the fun keyword is used to define a function. For example, fun sayHello() {} is a simple Kotlin function declaration.

In Kotlin, the var keyword is used to create a mutable variable. You can change the value of a var after its initial assignment.

In Kotlin, single-line functions can be defined concisely using an equals sign = followed by the expression, e.g., fun add(a: Int, b: Int) = a + b.

In Kotlin, val is used to declare an immutable (read-only) variable.

The lateinit keyword in Kotlin is used for variables that are initialized after declaration. It is often used for properties that are initialized in a lifecycle method or dependency injection.

In Kotlin, the primary constructor is a concise way to initialize a class. It is declared in the class header and can include parameters to initialize properties.

In Kotlin all primitive data types are Objects. So, they start with Capital Letters. Unlike java, it doesn't use the Wrapper class for primitive data types to behave like Objects. It reduces the confusion of two different Implementation of Numbers type which makes Kotlin more concise.

Kotlin provides many modern programming features, including null safety to prevent NullPointerExceptions, lambda expressions for functional programming, and a concise syntax that omits semicolons.