Clamps value between 0 and 1 and returns value.

	// Set the position of the transform to be that of the time
	// but never less than 0 or more than 1
	function Update () {
		transform.position = Vector3(Mathf.Clamp01(Time.time), 0, 0);
	}

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void Update() {
        transform.position = new Vector3(Mathf.Clamp01(Time.time), 0, 0);
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def Update() as void:
		transform.position = Vector3(Mathf.Clamp01(Time.time), 0, 0)