Random card drawer
A freshly shuffled deck is waiting. Draw a few cards or deal hands; drawn cards stay out until you collect them and reshuffle.
Draw
Deal hands
52 cards left
Press Draw to turn over the top card, or Deal to hand out cards round the table.
No cards drawn from this deck yet.
Drawing and dealing
The deck is shuffled as soon as the page opens. Draw takes cards off the top, so a card cannot come up twice until you collect the cards again, and the counter shows how many are left. Deal goes round the players one card at a time, the way a dealer does, for up to 10 players.
Shuffle the rest mixes the cards still in the deck without returning the drawn ones. Collect & reshuffle puts every card back and shuffles a fresh deck; ticking or unticking the jokers does the same.
Each shuffle is a Fisher–Yates shuffle driven by crypto.getRandomValues, so every one of the 52! possible orders of the deck, a number with 68 digits, is equally likely. Shuffling real cards by hand takes about seven riffle shuffles to get that close to random.
Sources
- Bayer D, Diaconis P. Trailing the dovetail shuffle to its lair. The Annals of Applied Probability 1992;2(2):294–313.
- Knuth DE. The Art of Computer Programming, Vol. 2: Seminumerical Algorithms, 3rd ed. Addison-Wesley, 1997, section 3.4.2.
Questions
What are the odds of drawing an ace?
From a full deck without jokers, 4 in 52, about 7.7%. The chance of one particular card, such as the queen of hearts, is 1 in 52.
Can the same card come up twice?
Not until you collect and reshuffle. Drawn cards stay out of the deck, just as they would on a real table.
What do the jokers do?
Nothing special: they are two extra cards, one red and one black, for games that use them.