//A very simple set. Fix this pretty quickly, as it will be a performance hit.

function Set(id) {

if(id === undefined)

id = function(el) {

return el.id;

};

this._id = id;

this._set = {};

Object.defineProperty(this._set, "length", {value : 0,

writable : true,

configurable : false,

enumerable : false});

}

Set.prototype.insert = function(el) {

if (this._id(el) === undefined) return false;

if(!this.exists(el)) {

this._set[this._id(el)] = el;

this._set.length += 1;

return true;

}

return false;

};

Set.prototype.remove = function(el) {

if(this.exists(el)) {

delete this._set[this._id(el)];

this._set.length -= 1;

return true;

}

return false;

};

Set.prototype.exists = function(el) {

// This works even if the value is explicitly undefined like {name: undefined}

return (this._id(el) in this._set);

};

Set.prototype.array = function() {

var array = [];

for (var key in this._set) {

array.push(this._set[key]);

}

return array;

};

Set.prototype.clone = function() {

var other = new Set(this._id);

for (var key in this._set)

other._set[key] = this._set[key];

return other;

};

Set.prototype.length = function () {

return this._set.length;

}

module.exports = Set;