How to Duplicate an Array in C#

Question

I'm working on a Blackjack simulator. I have the following string array called deck (I prefer to use an array over an enum):

string[] deck = { "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K", "A", };

User will enter the deck number with Input Dialog:

byte deckNumber;
deckNumber = Convert.ToByte(Interaction.InputBox("Enter The Deck Number", "Deck Number", "3", 10, 10));

How can I duplicate the array with deckNumber? For example user enter 2, array will be:

{ "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K", "A","2","3","4","5","6","7","8","9","10","J","Q","K","A" };

I think I need a for loop but I couldn't manage to do it.

Actually, a deck is a group of 52 cards.. not just 13 cards... — mlwn
– mlwn, Commented Oct 30, 2014 at 21:11
You're not serious, are you ? do you plan to write a software with only 13 cards out of the 52 ??? then, when you use twice, you don't want the first 3 to be different than the second 3 :??? they are all the same ?? just 3's ??? — mlwn
– mlwn, Commented Oct 30, 2014 at 21:19
@poster... please consider using the deck as a range 0 to 51... range(52) .. that would help you.. trust me... — mlwn
– mlwn, Commented Oct 30, 2014 at 21:25

L.B · Accepted Answer · 2014-10-30 21:12:10Z

4

string[] deck = { "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K", "A", };
var newDeck = Enumerable.Repeat(deck, 2).SelectMany(x => x).ToArray();

answered Oct 30, 2014 at 21:12

L.B

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Comments

Scott · Accepted Answer · 2014-10-30 21:31:10Z

1

If you are using .NET 3.5 or later, you can use LINQ as L.B. has shown:

var newDeck = Enumerable.Repeat(deck, 2).SelectMany(x => x).ToArray();

Enumerable.Repeat(deck, 2) gives you two elements that are each a string[], .SelectMany(x => x) flattens this into one series of strings, and .ToArray() obviously converts the series into an array.

Otherwise, you can use a loop:

var newDeck = new string[deck.Length * deckNumber];

for (int d = 0; d < deckNumber; d++)
{
    for (int i = 0; i < deck.Length; i++)
    {
        newDeck[d * deck.Length + i] = deck[i];
    }
}

answered Oct 30, 2014 at 21:31

Scott

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user1618077 · Accepted Answer · 2014-10-31 02:42:25Z

0

var source = new string[]{"a","b"};

var copy = new List(source).ToArray();

answered Oct 31, 2014 at 2:42

user1618077

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