21. What is conditions in Kotlin programming language?

February 09, 2025

🔍 Understanding Conditions in Kotlin Programming Language

Welcome, Kotlin developers! In this comprehensive guide, we'll dive deep into the world of conditions in Kotlin, exploring various ways to control program flow and make decision-making logic robust and elegant.

📌 Basic Conditional Statements

Kotlin provides multiple ways to implement conditional logic, with the primary mechanisms being 'if', 'when', and boolean expressions.

🔹 If-Else Statements

fun checkAge(age: Int) {
    if (age >= 18) {
        println("Adult")
    } else {
        println("Minor")
    }
}

🔹 When Expression

fun describeNumber(number: Int) = when {
    number < 0 -> "Negative"
    number == 0 -> "Zero"
    number > 0 -> "Positive"
}

🚀 Advanced Conditional Techniques

Range comparisons
Smart type casting
Elvis operator for null checks

🔹 Range Conditions

fun checkScore(score: Int) = when (score) {
    in 0..59 -> "Fail"
    in 60..79 -> "Good"
    in 80..100 -> "Excellent"
    else -> "Invalid Score"
}

🔹 Elvis Operator

val name: String? = null
val displayName = name ?: "Anonymous"

🏋️ Practical Exercises

1. Create a function to categorize temperatures 2. Implement a grading system using 'when' 3. Build a simple age verification system 4. Use smart casting with type checks 5. Develop a null-safe string processing method

Pro Tip: Always prefer 'when' over multiple 'if-else' chains for better readability and performance.

🎓 Key Takeaways

Kotlin's conditional statements are powerful, concise, and provide multiple ways to handle complex logic. By mastering these techniques, you can write more expressive and maintainable code.

#Kotlin #ProgrammingConditions #AndroidDev

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