Generic type array shuffling based on @fincha solutions

EnumerableExtensions

using System.Collections.Generic;
using UnityEngine;

public static class EnumerableExtensions {

    public static T[] ShuffleArray<T>(this T[] a) {
        // Loops through array
        for (int i = a.Length - 1; i > 0; i--) {
            // Randomize a number between 0 and i (so that the range decreases each time)
            int rnd = UnityEngine.Random.Range(0, i);

            // Save the value of the current i, otherwise it'll overright when we swap the values
            T temp = a[i];

            // Swap the new and old values
            a[i] = a[rnd];
            a[rnd] = temp;
        }

        return a;
    }
    
}

All arrays automatically gets the shuffle method so you can access it on any array by simple calling anyArrayName.ShuffleArray();

Adapted from this gist by @fincha https://gist.github.com/fincha/7770c902b674973353e0