how to create a dictionary in unity code example

Example 1: dictionary in c# unity

public class ScriptA : MonoBehaviour{
    public Dictionary<string, GameObject> dictio = new Dictionary<string, GameObject>();
}

Example 2: unity dictionary

//create dictionary "test", with key as float and value as GameObject
private Dictionary<float, GameObject> test = new Dictionary<float, GameObject>();

//add thing to dictionary
private void addToDictionary()
{
  //add key 10 and this gameObject
  test.Add(10, transform.gameObject);
}

private void printFromDictionary()
{
  //try to get value and save it as out GameObject result
  test.TryGetValue(10, out GameObject result);
  //then print that result
  print(result);
}

private void deleteFromDictionary()
{
  //remove key and gameObject 10 from our Dictionary
  test.Remove(10);
}