A tweet-sized, fork-to-play, implementation of the game Paper/Scissors/Rock/Lizard/Spock
-
-
Save padawin/11213132 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| function( | |
| p // p is the player choice, a char in | |
| // ['P','R','L','V','S']. If p is any other | |
| // char, the result will be the same as with | |
| // 'S' | |
| // P is for Paper | |
| // R is for Rock | |
| // L is for Lizard | |
| // V is for Spock | |
| // S is for Scissors | |
| // Each choice is associated to its index in | |
| // the string. For each index I, here is the | |
| // list of the indexes I can beat: | |
| // 0 => 1, 3 (Paper beats Rock and Spock) | |
| // 1 => 2, 4 (Rock beats Lizard and Scissors) | |
| // 2 => 3, 0 (Lizard beats Spock and Paper) | |
| // 3 => 4, 1 (Spock beats Scissors and Rock) | |
| // 4 => 0, 2 (Scissors beats Paper and Lizard) | |
| ){ | |
| p='PRLVS'.search(p) // Convert the player choice into an integer | |
| +5-( // To that add 5 and subtract the computer | |
| // choice (randomly generated) | |
| 0| // This is to floor the computer choice | |
| Math.random()*5 // Computer choice, which is a float between | |
| // 0 and 5 | |
| ); | |
| return // Return 1 if the game is a draw, true if | |
| // the player wins or false if the computer | |
| // wins | |
| (p%=5) // Redifine p as p%5. For the player to win, | |
| // (the difference between the player and the | |
| // computer choice) modulo 5 must be equal to | |
| // 2 or 4. If the modulo is 0, the game is a | |
| // draw, otherwise (1 or 3), the computer wins. | |
| ? | |
| !(p&1) // different than zero, return true if even | |
| // result, false if odd result | |
| : | |
| 1 // draw | |
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <html> | |
| <head></head> | |
| <body> | |
| <span id="result"></span> | |
| <script type="text/javascript"> | |
| var prlvs = function(p,c){p='PRLVS'.search(p)+5-c;return(p%=5)?!(p&1):1} | |
| var list = { | |
| 'win': [ | |
| ['P', 1], | |
| ['P', 3], | |
| ['R', 2], | |
| ['R', 4], | |
| ['L', 3], | |
| ['L', 0], | |
| ['V', 4], | |
| ['V', 1], | |
| ['S', 0], | |
| ['S', 2] | |
| ], | |
| 'lose': [ | |
| ['P', 2], | |
| ['P', 4], | |
| ['R', 0], | |
| ['R', 3], | |
| ['L', 1], | |
| ['L', 4], | |
| ['V', 0], | |
| ['V', 2], | |
| ['S', 1], | |
| ['S', 3] | |
| ], | |
| 'draw': [ | |
| ['P', 0], | |
| ['R', 1], | |
| ['L', 2], | |
| ['V', 3], | |
| ['S', 4], | |
| ] | |
| }; | |
| for (var result in list) { | |
| document.getElementById('result').innerHTML += 'Expected result: ' + result + '<br />'; | |
| for (var m in list[result]) { | |
| var move = prlvs(list[result][m][0], list[result][m][1]); | |
| if(move === true) | |
| document.getElementById('result').innerHTML += 'You won<br />'; | |
| else if (move === false) | |
| document.getElementById('result').innerHTML += 'You lost<br />'; | |
| else | |
| document.getElementById('result').innerHTML += 'draw<br />'; | |
| } | |
| } | |
| </script> | |
| </body> | |
| </html> |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| function(p){p='PRLVS'.search(p)+5-(0|Math.random()*5);return(p%=5)?!(p&1):1} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| Version 2, December 2004 | |
| Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE> | |
| Everyone is permitted to copy and distribute verbatim or modified | |
| copies of this license document, and changing it is allowed as long | |
| as the name is changed. | |
| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION | |
| 0. You just DO WHAT THE FUCK YOU WANT TO. |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| { | |
| "name": "PaperScissorsRockLizardSpock", | |
| "description": "Implementation of the Famous game | |
| Paper/Scissors/Rock/Lizard/Spock in less than 140 bytes", | |
| "keywords": [ | |
| "Paper", | |
| "Scissors", | |
| "Rock", | |
| "Lizard", | |
| "Spock", | |
| "Game" | |
| ] | |
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <html> | |
| <head></head> | |
| <body> | |
| <select id="player"> | |
| <option value="P">Paper</option> | |
| <option value="R">Rock</option> | |
| <option value="L">Lizard</option> | |
| <option value="V">Spock</option> | |
| <option value="S">Scissor</option> | |
| </select> | |
| <input type="button" id="playbtn" value="Play"/> | |
| <span id="result"></span> | |
| <script type="text/javascript"> | |
| var prlvs = function(p){p='PRLVS'.search(p)+5-(0|Math.random()*5);return(p%=5)?!(p&1):1} | |
| document.getElementById('playbtn').onclick=function(){ | |
| var result = prlvs(document.getElementById('player').value); | |
| if(result === true) | |
| document.getElementById('result').innerHTML = 'You won'; | |
| else if (result === false) | |
| document.getElementById('result').innerHTML = 'You lost'; | |
| else | |
| document.getElementById('result').innerHTML = 'draw'; | |
| } | |
| </script> | |
| </body> | |
| </html> |
Wait, c is only used once, so we can remove it safely, golfing it down to 81 chars:
function(p){p='PRLVS'.indexOf(p);return(p=(p+5-(0|Math.random()*5))%5)?!!(p&1):1}
And by pulling most of the calculation into the first expression, we can remove 3 more bytes (down to 78):
function(p){p='PRLVS'.indexOf(p)+5-(0|Math.random()*5);return(p%=5)?!!(p&1):1}
Awesome, thanks!
I learnt quite a few thinks in your optimisations:
- Doing a floor like that, quite handy: 0|Math.random()*5
- convert 1 or 0 to boolean with !!(...), that's so obvious, but I never thought about it....
However, your version returns false if the player wins and true if the computer wins. Easily fixed by removing a !
in the last test (which downs it to 77 ;-) ).
When I rewrote it to understand your changes, I ended with the version p%2 instead of p&1, do you think one's better than the other?
%2 and &1 are basically doing the same, but the latter is faster, since it uses long int instead of float.
I like to remind people that there are binary operations around in JS which are quite powerful and really, really fast.
fair enough, it makes sense.
changed :-)
or you just replace .indexOf with .search
Thanks, updated
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
How about golfing this down to 85 chars?