The Dictionary class lets you create a dynamic collection of properties, which uses strict equality
(
===) for key comparison. When an object is used as a key, the object's
identity is used to look up the object, and not the value returned from calling
toString() on it.
The following statements show the relationship between a Dictionary object and a key object:
var dict = new Dictionary();
var obj = new Object();
var key:Object = new Object();
key.toString = function() { return "key" }
dict[key] = "Letters";
obj["key"] = "Letters";
dict[key] == "Letters"; // true
obj["key"] == "Letters"; // true
obj[key] == "Letters"; // true because key == "key" is true b/c key.toString == "key"
dict["key"] == "Letters"; // false because "key" === key is false
delete dict[key]; //removes the key
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