blackJackd

Blackjack simulator in Javascript.

try it

Work in progress.. but functional. Please let me know if you see any ways to make it even faster!

Supports pretty much everything (except re-splitting and insurance):

• dealer stands on any 17 (hard or soft)
• multi-player
• players use basic strategy
• player splitting
• player blackjack pays 3 to 2
• dealer blackjack wins (unless a player also has blackjack then they push)
• double doubling down doubles the winnings
• Results show (after about 1 million rounds) a house advantage of .5 percent, so it's accurate

To use, open the blackJackd_vX.html file in Chrome, input the game values, and view results in console.

Alternatively, you can use Node instead of running in the browser, both are equally fast.

To use with Node, update these variables in the blackJackd_vX.js file.

const DEBUG = false; // will output a whole bunch of stuff if true

const numPlayers = 1; // use as many as you want
const numRounds = 1000000; //100000000;
const numDecks = 8;
const outputInterval = 100000; // how often to show results snapshot

Then run it and sit back and wait

node blackJackd_vX.js

The results show:

[ win, loss, tie ]  win percentage

node blackJackd_v2.js

[ 0, 1, 0 ] 0
[ 51785, 53694, 8453 ] 49.09508053735815
[ 104079.5, 106828, 16854 ] 49.34841103327288
[ 156301, 159995, 25317 ] 49.416053317145966
[ 208501, 213133, 33912 ] 49.4507084343293
[ 260481.5, 266413, 42442 ] 49.43712640765846
[ 312732.5, 319571, 51024 ] 49.45923911539316
[ 365097.5, 372571, 59597 ] 49.493437770489045
[ 417079.5, 425984, 67901 ] 49.47189624506339
[ 469282, 479211, 76408 ] 49.47659076029027
testGameLoop: 59498.218ms
WINS ----- 521530.5
LOSS ----- 532501
TIES ----- 84784