Try It Yourself - SyntaxStudy Editor

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// Java-style verbose class (for comparison)
// public class Person {
//     private String name; private int age;
//     public Person(String name, int age) { ... }
//     public String getName() { ... }
//     // + equals, hashCode, toString ...
// }

// Kotlin equivalent — one line
data class Person(val name: String, val age: Int)

fun main() {
    val alice = Person("Alice", 30)
    val bob   = alice.copy(name = "Bob", age = 25)

println(alice)          // Person(name=Alice, age=30)
    println(bob)            // Person(name=Bob, age=25)
    println(alice == bob)   // false — structural equality

// Smart cast
    val obj: Any = "Hello"
    if (obj is String) {
        // obj is automatically cast to String here
        println(obj.uppercase())
    }

// When expression (enhanced switch)
    val score = 85
    val grade = when {
        score >= 90 -> "A"
        score >= 80 -> "B"
        score >= 70 -> "C"
        else        -> "F"
    }
    println("Grade: $grade")
}