Chooses values from an array using a probabilities array

ChooseWithProbabilities.cs

/// <summary>
///Returns a random object from the array with probabilities
///</summary>
/// <param name="prob">the probability of being chosen for each value in the array, their sum must be <= 1</param>
public static T ChooseWithProbabilities<T>(float[] prob,params T[] array)
{
    float rn = RNG.Randf();
    int len = array.Length;
    float[][] intervals = new float[len][];
    if (len != prob.Length || len == 0)
    {
        return default;
    }
    float total = 0;
    float intervalStart = 0;
    for (int i = prob.Length - 1; i >= 0; --i)
    {
        intervals[i] = new float[2];
        intervals[i][0] = intervalStart;
        intervals[i][1] = intervalStart + prob[i];
        total += prob[i];
        intervalStart += intervals[i][1];
    }
    if (total > 1 && (Mathf.Abs(total - 1) > 0.01f))
    {
        GD.PrintErr("Bad probabilities array");
        return default;
    }

    for (int i = intervals.Length - 1; i >= 0; --i)
    {
        if (rn >= intervals[i][0] && rn <= intervals[i][1])
        {
            return array[i];
        }
    }

    return default;
}

Not unit tested, used in godot engine, the intervals could be stored in a struct to play nicer with the GC, but I wasn't calling it every frame so I just used arrays.