Coroutine Inherits from YieldInstruction

MonoBehaviour.StartCoroutine returns a Coroutine. Instances of this class are only used to reference these coroutines and do not hold any exposed properties or functions.

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

JavaScript

// - 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);
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    IEnumerator WaitAndPrint() {
        yield return new WaitForSeconds(5);
        print("WaitAndPrint " + Time.time);
    }
    IEnumerator Example() {
        print("Starting " + Time.time);
        yield return WaitAndPrint();
        print("Done " + Time.time);
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def WaitAndPrint() as IEnumerator:
        yield WaitForSeconds(5)
        print(('WaitAndPrint ' + Time.time))

    def Example() as IEnumerator:
        print(('Starting ' + Time.time))
        yield WaitAndPrint()
        print(('Done ' + Time.time))