simple demo of lists and foreach for my Recursive Reality VR class, spring 2015

ListDemo.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic; // STEP 1 OF USING A LIST: include this line

// a "List" is like an Array
// an array = "immutable", it cannot be resized
// a list = dynamically resizable, elastic, will stretch or shrink based on item count

// demo: I'm going to instantiate spheres, track the spheres using a list, and
// modify all of the spheres inside the list

public class ListDemo : MonoBehaviour {

	public Transform spherePrefab; // assign in Inspector
	public List<Transform> mySpheres = new List<Transform>();

	public List<Light> myLights = new List<Light>(); // you can declare a List of *anything*!!!

	// Update is called once per frame
	void Update () {

		if (Input.GetKeyDown (KeyCode.P) ) {
			// instantiate a new clone, and remember it as "newSphereClone"
			Transform newSphereClone = (Transform)Instantiate ( spherePrefab, Random.insideUnitSphere * 10f, Quaternion.Euler (0, 0, 0) );

			// add the sphere to the list
			mySpheres.Add ( newSphereClone );

			// rename the sphere (for demo purposes)
			newSphereClone.name = "Sphere" + mySpheres.Count.ToString ();
		}

		if ( Input.GetKeyDown (KeyCode.K) ) {
			// a ForEach loop is good for doing a lot of things at once to a set of variables
			foreach ( var eachSphere in mySpheres ) {
				eachSphere.localScale *= 2f;
				eachSphere.position += Vector3.up;
			}
		}

		foreach ( var sphere in mySpheres ) {
			sphere.localScale = Vector3.one * Mathf.Sin (Time.time );

			// this will do something different based on each list item's unique properties
			if (sphere.position.x > 0f) {
				// do something
			} else {
				// do something else
			}
		}


	}
}