如何管理集合的集合

Question

我正在寻找一种方法来管理集合的集合。参见下面的示例代码:

function Collection() {
    this.items = []; //Contains items, which have a date associated with them
}
Collection.prototype.doSomethingOnItems = function(){};
function SuperCollection() {
    this.collections = []; //An array of Collection objects
    this.group = []; //A vector with a string that designates the group (e.g. 2013, 2012)
}
SuperCollection.prototype.groupCollections = function(items, groupType) {
    //Group by year, month, day, etc...
    //For example, given a timeframe of 2012-2013, items in 2012 are put in collections[1], those from 2013 are in collections[2]
}

有更好的方法来管理这样的结构吗?

Answer 1

我喜欢让事情尽可能的一般化/抽象化

function Collection(items)
{
    // Could/should do some checking/coercion here 
    this.items = items || [];
};
Collection.prototype.add = Collection.prototype.push = function(item)
{
    this.items.push(item);
};
Collection.prototype.remove = function() {} ....
 // etc...
// A single Group
function Group(name, items)
{
    this.name = name;
    this.items = new Collection(items);
};
// A Collection of groups
function Groups()
{
    this.groups = new Collections();
};

或者你可以用集合的原型扩展组的原型(继承的一种形式)例如(使用jQuery，或任何其他库，或编写自己的)

function Groups()
{
};
$.extend(Groups.prototype, Collection.prototype);

剩下的是:

var groups = new Groups();
groups.add(new Group("2013", []));

所有这些都允许您保持逻辑分离，以及在组/组'类'中包含辅助方法，这些'类'与您的集合'类'分开