How do i generate a random number that only shows up Once? : <p>I'm trying to generate up to 5 numbers between 0-4 and doesn't re generate the same number more than once. The program will stop after three attempts, therefore the random numbers generated should read 4,3,2 and not 4,3,4(For example).</p>

<p>I've created an array with 5 string elements in it. at least 3 of the  strings in the array will be displayed on a label when the button is clicked 3 times. After the button is clicked 3 times, the app will come to an end. However, the issue is that some of the strings in the array keeps repeating itself each time the button is clicked.
I found a method that prevents the number from repeating (1,3,1) instead of (1,1,3) for eg. But in my case i do not want a number to be generated once it was already generated. For eg. (1,3,4) instead of (1,3,1) where the (1) is re-generated.</p>

<pre><code>var fruits: [String] = ["Apple", "Mango", "Cherry", "Strawberry", "Blueberry", "Banana"] // fruits to be displayed in the label

func randomizeNum() -&gt; UInt32 {
        var randomNumber = arc4random_uniform(UInt32(fruits.count))
        while previousNumber == randomNumber {
            randomNumber = arc4random_uniform(UInt32(fruits.count))
        }
        displayLbl.text = fruits[Int(randomNumber)]
        previousNumber = randomNumber

        print("the random num is \(randomNumber)") // This prints for example 5, 1, 5. Need it to print only numbers that's not yet displayed with 3 attempts.
        return randomNumber
    }
</code></pre>

<p>I expect the output of this function to generate a random number like 0,4,1 but it generates 5,1,5 or 0,4,0 where the (0) is re-generated again.</p>
