What are the main advantages of using Kotlin compared to Java for Android or server-side development?

Kotlin has several advantages over Java when developing for Android and server-side:

• More concise and expressive syntax: Kotlin allows writing less code for the same tasks, reducing the likelihood of errors.
• Null safety: built-in type system helps avoid NullPointerException.
• Support for functional programming: lambda expressions, extension functions, and other features make the code more flexible.
• Java interoperability: Kotlin is fully compatible with Java, easing migration and use of existing libraries.
• Coroutine model for asynchronous programming: simplifies writing asynchronous and concurrent code.

Example of simple Kotlin code:

fun greet(name: String?): String {
    return "Hello, ${name ?: "Guest"}!"
}

Here, the Elvis operator ?: is used to handle nulls, making the code safer and shorter.