gistfile1.js

var Compose = require("compose")

var livingThing = Compose({
  alive: false,
  isDead: function() {
    return !this.alive
  },
  isAlive: function() {
    return this.alive
  },
  live: function() {
    this.alive = true
  },
  die: function() {
    this.alive = false
  }
})

var withNeighbors = Compose({
  knownNeighbors: 0,
  meetNeighbors: function(count) {
    count = count || 1
    this.knownNeighbors += count 
  },
  forgetNeighbors: function() {
    this.knownNeighbors = 0
  }
})

var Cell = Compose(
  livingThing,
  withNeighbors,
  {
    evolve: function() {
      if (this.knownNeighbors < 2) {
        this.die()
      }
      if (this.knownNeighbors == 3) {
        this.live()
      }
      if (this.knownNeighbors > 3) {
        this.die()
      }
    }
  }
)