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Dice Pool 140

A 140byt.es gist to generate a simulated dice pool.

function(n){ // variable n is the number of dice to roll
var d=6; // six sides
var x=4; // must get a four or higher to be a success
var v=0; // success counter
for(i=0;i<n;i++){ // begin rolling loop
r=0|(Math.random()*s)%s+1; // "roll" a single die
if(r>=x){ // compare the result to the success value
v++; // if a success, increment the counter
}
}
return v; // output the number of successes
}
function(n){var d=6;var x=4;s=6;x=4;v=0;for(i=0;i<n;i++){r=0|(Math.random()*s)%s+1;if(r>=x){v++;}}return v;}
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
Version 2, December 2004
Copyright (C) 2011 Ben Overmyer <www.manatrance.com>
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.
{
"name": "dicePool",
"description": "Generate a simulated dice pool.",
"keywords": [
"dice",
"random",
"rpg"
]
}
<!DOCTYPE html>
<title>Dice Pool Roller</title>
<script>
var diceRoll = function(n){var d=6;var x=4;s=6;x=4;v=0;for(i=0;i<n;i++){r=0|(Math.random()*s)%s+1;if(r>=x){v++;}}return v;}
console.log(diceRoll(12));
console.log(diceRoll(18));
</script>
@atk

Even if it is not 140bytes yet, please show us your code so we could help you golfing it down to the desired size.

@tsaniel

There are many similar forks these day...

@BenOvermyer
Owner

I'm brand new to this. If a dice pool has been done before, I'd rather do something new and interesting.

@atk

tsaniel referred to forks without actual script content; as far as I know a dice pool has not yet been done as 140byt.es gist. How would you implement a dice pool in JS anyway? Would you just input the number and faces of the dices and add Math.random()faces every time? Or would you support complex game mechanics described by a string parsed with a regex, e.g. "3d6+d20-d8"?

@BenOvermyer
Owner

This particular dice roller is just intended for d6-based wargames; it'd be fairly easy to modify it to do other die types. Complex dice rolls are a different matter.... might do that for the next gist.

@atk

Just tried my hand at the complex roll but without target check:

function(a,b){return b=0,a.replace(/(-?)((\d+)\*|)d(\d+)/g,function(c,d,e,f,g){for(f=f||1;f--;b+=(d+1)*(1+(0|Math.random()*g)));}),b}

Be sure not to leave your variables in the scope - either use var or argument variables. Try to optimize your version according to the tips in the Wiki, e.g. Math.round can be replaced with 0| - and you probably wanted Math.floor anyway. There are many places to exploit coercions on this one, too.

Other than that, the function can be executed on the console, no need for prompt or alert, rather use variables and return, like this:

function(n,s,x,v,i){for(v=i=0;i<n;i++)v+=(1+(0|Math.random()*s))>x;return v}
@BenOvermyer
Owner

Modified a bit, though not as efficiently as your variation.

...now I'm really starting to get into JS. Good way to start the morning!!!

@atk

Feel free to take it. If you have any question, feel free to ask - we're a pretty helpful bunch here ;-)

@atk

At least combine the var-statements: var x=1,y=0,...;

@BenOvermyer
Owner

@atk - I'm curious, how does this part of your version work?

v+=(1+(0|Math.random()*s))>x;

There's no IF in there anywhere.... some kind of shorthand I'm missing?

@atk

The answer is: Coercion. Let us dissect the corresponding part:

1+(0|Math.random()*s) generates a floored Number between 1 and s (0| coerces the float-points produced by Math.random() to integer).
...>x compares the resulting number with x and returns true if bigger and false if smaller - at this point we have a boolean.
v+=... adds the expression to v, coercing true to 1 and false to 0 - only if the result is bigger, v gets incremented.

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