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Coroutine Class, inherits from YieldInstruction  

Scripting > Runtime Classes > Coroutine

MonoBehaviour.StartCoroutine returns a Coroutine.

A coroutine is a function that can suspend its execution (yield) until the given given YieldInstruction finishes.

// - prints "Starting 0.0"
// - prints "WaitAndPrint 5.0"
// - prints "Done 5.0"
print ("Starting " + Time.time);
// Start function WaitAndPrint as a coroutine
yield WaitAndPrint();
print ("Done " + Time.time);

function WaitAndPrint () {
// suspend execution for 5 seconds
 yield WaitForSeconds (5);
print ("WaitAndPrint "+ Time.time);
}