ツリーを処理するサンプル

categories.js

var Category = function (name, child) {
  var self = this;
  this.name = name;
  this.children = child;
  this.accept = function(Visitor) {
    Visitor.visit(self);
  };
};

var Visitor = function () {
  this.visit = function(Category) {
    console.log(Category.name);
    var len = Category.children.length;
    if (len > 0) {
      for (var i = 0; i < len; i++) {
        Category.children[i].accept(this);
      }
    }
  }
};


var Categories = [new Category('aaa', []), new Category('bbb', [new Category('ccc', [new Category('ddd', [])])])];
for (var i = 0; i < Categories.length; i++) {
  Categories[i].accept(new Visitor());
}