try Expression in Kotlin

Introduction

try Expression is a fundamental concept every Kotlin developer should understand. Exceptions signal that something went wrong at runtime. Kotlin treats checked exceptions differently from Java, encouraging explicit error handling where it matters.

In Kotlin, try-catch can be used as an expression that returns a value. In this tutorial you will learn the syntax, walk through a complete example program, study the sample output, and review best practices so you can apply the concept confidently in your own projects.

Definition

• In Kotlin, try-catch can be used as an expression that returns a value.
• The last expression in try or catch becomes the result.
• This reduces the need for temporary variables.

Syntax

val result = try { a / b } catch (e: Exception) { 0 }

try Expression in Kotlin Example Program in Kotlin

fun main(args: Array<String>) {
    fun divide(a: Int, b: Int): Int {
        return try {
            a / b
        } catch (e: ArithmeticException) {
            0
        }
    }
    println("10 / 2 = ${divide(10, 2)}")
    println("10 / 0 = ${divide(10, 0)}")
}

Sample Output

10 / 2 = 5
10 / 0 = 0

When to use

Use try/catch when calling code that can fail — file access, network calls, parsing — and you need a controlled recovery path.

How it works

1. The program starts with a main function — the entry point that runs when you execute the file.

2. The println("10 / 2 = ${divide(10, 2)}") statement writes a line to the console — this produces part of the sample output below.

3. The println("10 / 0 = ${divide(10, 0)}") statement writes a line to the console — this produces part of the sample output below.

4. In Kotlin, try-catch can be used as an expression that returns a value.

5. Run the program in IntelliJ IDEA, Android Studio, or with the Kotlin command-line compiler (kotlinc / kotlin). Compare your console output with the sample output shown below.

Best Practices

Common Mistakes

Key Points

• In Kotlin, try-catch can be used as an expression that returns a value.
• The last expression in try or catch becomes the result.
• This reduces the need for temporary variables.
• Test the example locally and verify the output matches the sample.
• Experiment by changing input values to see how behaviour changes.

Notes

• Semicolons at the end of statements are optional in Kotlin.