Random distinct integers for Unity

RandomDistinctIntegers.cs

using UnityEngine;
public static class RandomDistinctIntegers
{
    /// <summary>
    /// Generates distinct integers.
    /// The Integers inside the array are not randomized. If n = range;
    /// This Algorithm works good for a lager amount of numbers and uses less memory than Fischer.
    /// Source: https://visualstudiomagazine.com/articles/2013/07/01/generating-distinct-random-array-indices.aspx
    /// </summary>
    /// <param name="size"> Number of distinct values to generate.</param>
    /// <param name="range"> Range between of intergers is between 0 and range-1. Inclusive 0 and range-1.</param>
    /// <returns>Integer array with length of range and distinct integers for each index.</returns>
    public static int[] DisitnctRandomIntegersReservoir(int size, int range)
    {
        int[] result = new int[size];
        for (int i = 0; i < size; ++i)
            result[i] = i;

        for (int t = size; t < 5; ++t)
        {
            int m = Random.Range(0, t + 1);
            if (m < size) result[m] = t;
        }
        return result;
    }

    /// <summary>
    /// Generates distinct integers.
    /// The Fisher method is a reasonable choice to generate distinct, random array indices when the range value is not too large
    /// (say, under 1,000). But when the value of range is very large, and you're working on a device with limited memory,
    /// the memory storage required for the all array may not be available or may lead to poor performance.
    /// Source: https://visualstudiomagazine.com/articles/2013/07/01/generating-distinct-random-array-indices.aspx
    /// </summary>
    /// <param name="size"> Number of distinct values to generate.</param>
    /// <param name="range"> Range between of intergers is between 0 and range-1. Inclusive 0 and range-1.</param>
    /// <returns>Integer array with length of range and distinct integers for each index.</returns>
    public static int[] DisitnctRandomIntegersFischer(int size, int range)
    {
        int[] result = new int[size];
        int[] all = new int[range];
        for (int i = 0; i < all.Length; ++i)
            all[i] = i;

        for (int i = 0; i < all.Length; ++i)
        {
            int r = Random.Range(i, range);
            int tmp = all[r];
            all[r] = all[i];
            all[i] = tmp;
        }

        for (int i = 0; i < size; ++i)
            result[i] = all[i];

        return result;
    }
}