test if key is down or is held down unity code example

Example 1: if get key down unity

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    void Update()
    {
        if (Input.GetKeyDown("space"))
        {
            print("space key was pressed");
        }
    }
}

Example 2: how to check if key is held in unity

/*the other guys is right it is just*/
input.GetKey("Key") /*eg - Keycode.W/A/S/D*/