RosettaCodeData/Task/Events/Wren/events.wren

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import "scheduler" for Scheduler
import "timer" for Timer
var a = 3
// add a task
Scheduler.add {
a = a * a
}
// add another task
Scheduler.add {
a = a + 1
}
System.print(a) // still 3
Timer.sleep(3000) // wait 3 seconds
System.print(a) // now 3 * 3 + 1 = 10