README.md

Mini Mini Game of life

A game of line engine where everything that can be passed as parameter, is.

Score: 81b.

annotated.js

// Choose an integer d.
// Prepare a square grid of size d * d. And a JS array representing its state with booleans.
// Prepare another JS array that will be edited by this function

// @param s: current state of the grid (array)
// @param n: next state of the grid (another array)
// @param i: number of cells in the grid (i = d * d)
// @param m: neighbours offsets (array filled with: [d + 1, d, d - 1, 1, -1, - d - 1, - d, - d + 1])
// @param j: placeholder
// @param k: placeholder
function(s, n, i, m, j, k){
  for(
    ;
    i--;                                // For each cell
    n[i] = k == 3 || s[i] && k == 2,    // Set next state (live if it has 3 neighbours or if it lives and has 2 neighbours)
    k = 0                               // Reset the count of living neighbours
  ){
    for(j in m){                        // loop on neighbours offsets
      k += s[i + m[j]]                  // count the living neighbours
    }
  }
}

index.js

function(d,g,c,e,f,b){for(;c--;g[c]=3==b||d[c]&&2==b,b=0)for(f in e)b+=d[c+e[f]]}

Could 3==b||d[c]&&2==b be replaced with b==3-d[c]?

Update: no, because if it lives, 3 neighbours will also suffice, but we can do (b|d[c])==3 instead, saving 3 chars to your current solution.

Thanks atk! I'll try to use your trick in the whole new version of http://xem.github.io/miniGameOfLife

BTW, as our friends @aemkei and @subzey pointed out, it's nonsense to put as many things as possible in the parameters:

https://twitter.com/MaximeEuziere/status/474633537262333952

:)

That'll only work with true/false, not with 0/1, so it might not work with your current approach.