JS prototypal object creation 3/1/2011

neighborhood.js

// Working on my JS idioms
// fragment, not tried yet.
  neighborhood = new function() {
    // prototype object saved in closure
    var proto = {
      add_cell: function(location) {
        var key = location.key();
        if (this.cells_and_neighbors.hasOwnProperty(key)) {
          this.cells_and_neighbors[key].revive();
        } else {
          this.cells_and_neighbors[key] = live_cell(location);
        }
      },
      add_neighbor: function(location) {
        var key = location.key();
        if (!this.cells_and_neighbors.hasOwnProperty(key)) {
          this.cells_and_neighbors[key] = dead_cell(location);
        }
        this.cells_and_neighbors[key].increment_neighbor_count();
      },
    };
    return function() {
      // functions put in prototype
      var neighborhood = coot.create(proto); // local version of object.create()
      // initialize "instance" variables
      neighborhood.cells_and_neighbors = {};
      return neighborhood;
    };
  };