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private T[] ShuffleArray<T>(T[] array) {
    System.Random r = new System.Random ();
    for(int i = array.Length; i > 0; i--) {
        int j = r.Next (i);
        T k = array [j];
        array [j] = array [i - 1];
        array [i - 1] = k;
    }

    return array;
}

Example:

Int Array

int[] intArray = new int[] {1,2,3,4};

intArray = ShuffleArray(intArray);

Float Array

float[] floatArray = new float[] {1.0f,2.0f,3.0f,4.0f};

floatArray = ShuffleArray(floatArray);
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