Kotlin break

In Kotlin, the break keyword is used to terminate the execution of a loop or a when expression early. When a break statement is encountered inside a loop or a when expression, the program immediately exits the loop or the when expression and continues executing the next statement after the loop or the when expression.

Here's an example that demonstrates the use of the break statement in Kotlin:

fun main() {
    val numbers = arrayOf(1, 2, 3, 4, 5)
    for (number in numbers) {
        if (number == 3) {
            break
        }
        println(number)
    }
    println("Done")
}

In this example, the program creates an array of numbers, and then uses a for loop to iterate over the array. Inside the loop, the program checks if the current number is equal to 3, and if it is, the program uses a break statement to exit the loop early. After the loop, the program prints the string "Done" to the console. The output of the program is as follows:

1
2
Done

As you can see, the loop only iterated over the first two numbers in the array because the break statement caused the loop to terminate early when it encountered the number 3.

You can also use a break statement inside a when expression to terminate the execution of the expression early. Here's an example:

fun main() {
    val number = 3
    val result = when (number) {
        1 -> "One"
        2 -> "Two"
        3 -> {
            println("Found the number!")
            break
        }
        4 -> "Four"
        else -> "Other"
    }
    println(result)
}

In this example, the program uses a when expression to determine the value of the variable result based on the value of the variable number. Inside the when expression, the program checks if the value of number is equal to 3, and if it is, the program uses a break statement to terminate the execution of the when expression early. The output of the program is as follows:

Found the number!

As you can see, the break statement caused the program to exit the when expression before it could finish executing. The value of result is not set because the program did not reach the end of the when expression.