Example alteration system

FormulaHelper.cs

public delegate int Formula1I(ref int result, int a);

private struct WeightedCallback<T>
{
    public int Weight;
    public T Callback;
}

private static readonly Dictionary<string, List<WeightedCallback<Formula1I>>>  FormulaAlters1I = new Dictionary<string, List<WeightedCallback<Formula1I>>>();

public static void RegisterFormulaAlter(string formula, Formula1I callback, int weight = 1)
{
    WeightedCallback<Formula1I> weightedCallback = new WeightedCallback<Formula1I> {Weight = weight, Callback = callback};
    List<WeightedCallback<Formula1I>> alterations;
    if (FormulaAlters1I.TryGetValue(formula, out alterations))
    {
        alterations.Add(weightedCallback);
        alterations = alterations.OrderBy(o => o.Weight).ToList();
    }
    else
    {
        alterations = new List<WeightedCallback<Formula1I>>();
    }

    FormulaAlters1I[formula] = alterations;
}

private static void ApplyAlterations1I(string name, int input, ref int result)
{
    List<WeightedCallback<Formula1I>> alterations;
    if (FormulaAlters1I.TryGetValue(name, out alterations))
    {
        foreach (var alteration in alterations)
        {
            alteration.Callback.Invoke(ref result, input);
        }
    }
}

public static int DamageModifier(int strength)
{
    int result = (int)Mathf.Floor((float)(strength - 50) / 5f);

    ApplyAlterations1I("DamageModifier", strength, ref result);

    return result;
}