// In this example we show how to invoke a coroutine using a string name and stop it
    function Start () {
        StartCoroutine("DoSomething", 2.0);
        yield WaitForSeconds(1);
        StopCoroutine("DoSomething");
    }
    function DoSomething (someParameter : float) {
        while (true) {
            print("DoSomething Loop");
            // Yield execution of this coroutine and return to the main loop until next frame
            yield;
        }
    }

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    IEnumerator Start() {
        StartCoroutine("DoSomething", 2.0F);
        yield return new WaitForSeconds(1);
        StopCoroutine("DoSomething");
    }
    IEnumerator DoSomething(float someParameter) {
        while (true) {
            print("DoSomething Loop");
            yield return null;
        }
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Start() as IEnumerator:
        StartCoroutine('DoSomething', 2.0F)
        yield WaitForSeconds(1)
        StopCoroutine('DoSomething')

    def DoSomething(someParameter as single) as IEnumerator:
        while true:
            print('DoSomething Loop')
            yield