dependencies { implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.7'
}

 implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.9'

 implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.4.1'

launch - Launches new coroutine without blocking
current thread and returns a reference to the coroutine
as a Job.
runBlocking - Runs new coroutine and blocks current
thread interruptible until its completion.
async - Creates new coroutine and returns its future
result as an implementation of Deferred.
withContext - Change a coroutine context for some
block.

Channels
fun CoroutineScope.produceSquares(): ReceiveChannel<Int> = produce { for (x in 1..5) send(x * x) }
val squares = produceSquares()
repeat(5) { println(squares.receive()) } // 1, 4, 9, 16, 25
val squares2 = produceSquares()
for(square in squares2) print(square) // 1, 4, 9, 16, 25