Starts a new coroutine and blocks the current thread until completion.
Mainly used to bridge between blocking and non-blocking code in the main functions and tests.
💡 used rather occasionally
Example
kt
import kotlinx.coroutines.*
import java.time.LocalDateTime
import java.time.format.DateTimeFormatter
val formatter = DateTimeFormatter.ISO_LOCAL_TIME
val time = {
formatter.format(LocalDateTime.now())
}
suspend fun getValue(): Double {
println("entering getValue() at ${time()}")
delay(3000)
println("leaving getValue() at ${time()}")
return Math.random()
}
fun main() {
runBlocking {
val num1 = getValue()
val num2 = getValue()
println("result of num1 + num2 is ${num1 + num2}")
}
}The lambda passed to runBlocking() is a suspend function.
Output
entering getValue() at 17:44:52.311
leaving getValue() at 17:44:55.319
entering getValue() at 17:44:55.32
leaving getValue() at 17:44:58.32
result of num1 + num2 is 1.4320332550421415getValue() returns a random number after a set delay time. The main function calls getValue() twice and returns the sum.
💡 Doesn't return
Deferred