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  1. PO
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    <p>I think you're overcomplicating all of this. There's no reason you need to store the tag on the object itself. If you create a separate object that uses the object's pointer as a key, not only will you conserve space, but you'll prevent any unintentional collisions should the arbitrary object happen to have a property named "_tagged".</p> <pre><code>var __tagged = {}; function tag(obj){ __tagged[obj] = true; return obj; } function isTagged(obj){ return __tagged.hasOwnProperty(obj); } function getTagged(obj){ if(isTagged(obj)) return obj; } </code></pre> <p>== EDIT ==</p> <p>So I decided to take a minute to create a more robust tagging system. This is what I've created.</p> <pre><code>var tag = { _tagged: {}, add: function(obj, tag){ var tags = this._tagged[obj] || (this._tagged[obj] = []); if(tag) tags.push(tag); return obj; }, remove: function(obj, tag){ if(this.isTagged(obj)){ if(tag === undefined) delete this._tagged[obj]; else{ var idx = this._tagged[obj].indexOf(tag); if(idx != -1) this._tagged[obj].splice(idx, 1); } } }, isTagged: function(obj){ return this._tagged.hasOwnProperty(obj); }, get: function(tag){ var objects = this._tagged , list = [] ;//var for(var o in objects){ if(objects.hasOwnProperty(o)){ if(objects[o].indexOf(tag) != -1) list.push(o); } } return list; } } </code></pre> <p>Not only can you tag an object, but you can actually specify different types of tags and retrieve objects with specific tags in the form of a list. Let me give you an example.</p> <pre><code>var a = 'foo' , b = 'bar' , c = 'baz' ;//var tag.add(a); tag.add(b, 'tag1'); tag.add(c, 'tag1'); tag.add(c, 'tag2'); tag.isTagged(a); // true tag.isTagged(b); // true tag.isTagged(c); // true tag.remove(a); tag.isTagged(a); // false tag.get('tag1'); // [b, c] tag.get('tag2'); // [c] tag.get('blah'); // [] tag.remove(c, 'tag1'); tag.get('tag1'); // [b] </code></pre>
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    1. POImplement universal, lightweight, and unobtrusive tagging of arbitrary objects?
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    1. USTHEtheChad
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    1. POImplement universal, lightweight, and unobtrusive tagging of arbitrary objects?
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    1. COThere's still one reason to store the tag on the object itself: garbage collector.
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    2. COThat's a good point. If you deleted the object, you would also need to delete it from the collection. One could write a delete function that would make this rather trivial, though.
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