Random.Range

static function Range (min : float, max : float) : float

Description

Returns a random float number between and min [inclusive] and max [inclusive] (Read Only).

JavaScript
// Instantiates prefab somewhere between -10.0 and 10.0 on the x-z plane 
var prefab : GameObject;
function Start () {
var position: Vector3 = Vector3(Random.Range(-10.0, 10.0), 0, Random.Range(-10.0, 10.0));
Instantiate(prefab, position, Quaternion.identity);
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
public GameObject prefab;
void Start() {
Vector3 position = new Vector3(Random.Range(-10.0F, 10.0F), 0, Random.Range(-10.0F, 10.0F));
Instantiate(prefab, position, Quaternion.identity) as GameObject;
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

public prefab as GameObject

def Start():
position as Vector3 = Vector3(Random.Range(-10.0F, 10.0F), 0, Random.Range(-10.0F, 10.0F))
(Instantiate(prefab, position, Quaternion.identity) as GameObject)

static function Range (min : int, max : int) : int

Description

Returns a random integer number between min [inclusive] and max [exclusive] (Read Only).

If max equals min, min will be returned. The returned value will never be max unless min equals max.

JavaScript
// Loads a random level from the level list

Application.LoadLevel(Random.Range(0, Application.levelCount));

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void Example() {
Application.LoadLevel(Random.Range(0, Application.levelCount));
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def Example():
Application.LoadLevel(Random.Range(0, Application.levelCount))