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_h1 Conway's game of life

_p Wikipedia: [[Conway's_Game_of_Life|https://en.wikipedia.org/wiki/Conway%27s_Game_of_Life]].

{script ;; 
 
var LIFE = (function() {
  var board = [],
      xmax = 8, ymax = 8,
      interval = null,
      delay = 1000;
  
  var isdefined = function(x,y) {
    return typeof board[x]    !== 'undefined'
        && typeof board[x][y] !== 'undefined'
        && board[x][y];
  };

var alive = function(x,y) {
    var c = board[x][y],  // state 0|1
        n = 0;            // neighbours
    if (isdefined(x-1,y-1)) n++;
    if (isdefined(x  ,y-1)) n++;
    if (isdefined(x+1,y-1)) n++;
    if (isdefined(x-1,y  )) n++;
    if (isdefined(x+1,y  )) n++;
    if (isdefined(x-1,y+1)) n++;
    if (isdefined(x  ,y+1)) n++;
    if (isdefined(x+1,y+1)) n++; 
    if (n < 2 || n > 3) c = 0;  // dead
    if (n === 3)        c = 1;  // alive
    return c
  };

var nextGen = function() {
    var next = [];
    for (var x = 0; x < xmax; x++) {
      next[x] = [];
      for (var y = 0; y < ymax; y++)
        next[x][y] = alive(x,y); 
    }
    board = next
  };

var run = function(ctx,dw,dh) {
    print(ctx,dw,dh);
    nextGen()
  };

return { startstop }
 
}) ();  // end LIFE

}

{center
 {canvas {@ id="life" width="330" height="330" style="box-shadow:0 0 8px #000"}}{br}
 {input {@ type="button" value="start random" onclick="LIFE.startstop(this,'random')"}}
 {input {@ type="button" value="start cross" onclick="LIFE.startstop(this,'cross')"}}
}

_h2 '{lambda talk}

{pre °°
{center
 {input {@ type="button" value="start random"
           onclick="LIFE.startstop(this,'random')"}}
 {input {@ type="button" value="start cross"
           onclick="LIFE.startstop(this,'cross')"}}
 {canvas {@ id="life" width="330" height="330"
            style="box-shadow:0 0 8px #000"}}
}
°°}

_h2 Javascript

_p Following [[https://rosettacode.org/wiki/Conway%27s_Game_of_Life#JavaScript|https://rosettacode.org/wiki/Conway%27s_Game_of_Life#JavaScript]]

{pre °°
 
var LIFE = (function() {
  var board = [],
      xmax = 8, ymax = 8,
      interval = null,
      delay = 1000;
  
  var isdefined = function(x,y) {
    return typeof board[x]    !== 'undefined'
        && typeof board[x][y] !== 'undefined'
        && board[x][y];
  };

var alive = function(c,n) {
    if (n < 2 || n > 3) c = 0;
    if (n === 3) c = 1;
    return c
  };

var neighbours = function(x,y) {
    var n = 0;
    if (isdefined(x-1,y-1)) n++;
    if (isdefined(x  ,y-1)) n++;
    if (isdefined(x+1,y-1)) n++;
    if (isdefined(x-1,y  )) n++;
    if (isdefined(x+1,y  )) n++;
    if (isdefined(x-1,y+1)) n++;
    if (isdefined(x  ,y+1)) n++;
    if (isdefined(x+1,y+1)) n++; 
    return n
  };

var nextGen = function() {
    var next = [];
    for (var x = 0; x < xmax; x++) {
      next[x] = [];
      for (var y = 0; y < ymax; y++)
        next[x][y] = alive( board[x][y], neighbours(x,y) );
    }
    board = next
  };

var run = function(ctx,dw,dh) {
    print(ctx,dw,dh);
    nextGen()
  };

return { startstop }
 
}) ();  // end LIFE

°°}