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my version of Lea Verou's game of life life.js file
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| (function() { | |
| var _ = self.Life = function(seed) { | |
| this.seed = seed; | |
| this.height = seed.length; | |
| this.width = seed[0].length; | |
| this.prevBoard = []; | |
| this.board = cloneArray(seed); | |
| }; | |
| _.prototype = { | |
| next: function() { | |
| this.prevBoard = cloneArray(this.board); | |
| for(var y = 0; y < this.height; y++) { | |
| for(var x = 0; x < this.width; x++) { | |
| var neighbors = this.aliveNeighbors(this.prevBoard, x, y); | |
| // console.log("y is: " + y, "x is: " + x, ": " + neighbors); | |
| var alive = !!this.board[y][x]; | |
| if(alive) { | |
| if(neighbors < 2 || neighbors > 3) { | |
| this.board[y][x] = 0; | |
| } | |
| } | |
| else { | |
| if(neighbors === 3) { | |
| this.board[y][x] = 1; | |
| } | |
| } | |
| } | |
| } | |
| }, | |
| aliveNeighbors: function(array, x, y) { | |
| var prevRow = array[y - 1] || []; | |
| var nextRow = array[y + 1] || []; | |
| var neighbors = [ | |
| prevRow[x - 1], prevRow[x], prevRow[x + 1], | |
| array[y][x - 1], array[y][x + 1], | |
| nextRow[x - 1], nextRow[x], nextRow[x + 1] | |
| ].reduce(function(prev, cur) { | |
| return prev + +!!cur; | |
| }, 0); | |
| }, | |
| toString: function() { | |
| return this.board.map(function(row) { return row.join(' ') }).join('\n'); | |
| } | |
| }; | |
| // Helpers | |
| // Warning: only clones 2D arrays | |
| function cloneArray(array) { | |
| return array.slice().map(function(row) { return row.slice(); }); | |
| } | |
| })(); | |
| var game = new Life([ | |
| [0, 0, 0, 0, 0], | |
| [0, 0, 1, 0, 0], | |
| [0, 0, 1, 0, 0], | |
| [0, 0, 1, 0, 0], | |
| [0, 0, 0, 0, 0] | |
| ]); | |
| console.log(game + ''); | |
| game.next(); | |
| console.log(game + ''); | |
| game.next(); | |
| console.log(game + ''); |
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You forgot to return the result of the function aliveNeighbors. Use
return [instead ofvar neighbors = [.