If Expression in Kotlin

If Expression Definition

• In Kotlin, if is an expression, it returns a value based on condition.
• Which is equivalent to the ternary operator for other languages. In Kotlin there is no ternary operator (condition ? then: else).

Syntax

// As expression 
val varibale = if (condition) value1 else value1

For example,

val maximum = if(num1>num1) num1 else num2

If expression Example Program

// If Expression Kotlin example program
// Conditional Statements Kotlin Programs, Basic Kotlin Programs

fun main(args: Array<String>) {

    var num1 = 5
    var num2 = 10
    
    //If Expression returns Maximum Value
    val maximum = if(num1>num1) num1 else num2
    
    println("Maximum Value : $maximum")
}

Sample Output

Maximum Value : 10

How It Works

Here is a step-by-step walkthrough of how the Kotlin program for If Expression in Kotlin runs, line by line:

1. fun main(args: Array<String>) { — defines a function used by the program.
2. var num1 = 5 — declares or assigns a value the program uses.
3. var num2 = 10 — declares or assigns a value the program uses.
4. val maximum = if(num1>num1) num1 else num2 — declares or assigns a value the program uses.
5. println("Maximum Value : $maximum") — writes a line of output shown in the sample output.

After running it, compare your console output with the Sample Output above. Try changing the values and re-running the program to see how the result changes — experimenting is the fastest way to understand the logic.