Writing a simple coroutine which performs concurrent execution

kotlin_coroutines_concurrent_tasks_example1.kt

import kotlinx.coroutines.*
import kotlin.system.measureTimeMillis

fun main() {
    runBlocking {
        val executionTime = measureTimeMillis {
            val job1 = launch { // Coroutine 1
                delay(1000)
                println("Coroutine 1 completed")
            }

            val job2 = launch { // Coroutine 2
                delay(1000)
                println("Coroutine 2 completed")
            }

            val job3 = async { // Coroutine 3
                delay(1000)
                "Coroutine 3 result"
            }

            println("Performing other tasks while coroutines are executing...")

            // Wait for all coroutines to complete
            joinAll(job1, job2, job3)

            val result = job3.await()
            println("Coroutine 3 result: $result")
        }
        
        println("Total execution time: $executionTime ms")
    }
}

/*
Console output:
Performing other tasks while coroutines are executing...
Coroutine 1 completed
Coroutine 2 completed
Coroutine 3 result: Coroutine 3 result
Total execution time: 1023 ms // this value(i.e. 1023) may change a little but should be slightly greater than 1000ms.
*/