var o:Object = new Object();

o['1']=boolean;

o['5']=boolean;

o['1']=boolean;

for (var s:* in o){

trace (s);

}

res = new Array();

a.sort();

while(a.length > 0){

    b = a.shift();

    if(b != res[res.length - 1]){

           res.push(b)

    }          

}

var arr:Array = ["a", "b", "b", "c", "a"];

var i:int = arr.length;

// If you specify a value of 4 or Array.UNIQUESORT 

// for the sortOptions argument of the ...args parameter 

// and two or more elements being sorted have identical 

// sort fields, Flash returns a value of 0 and does not 

// modify the array

arr.sort(Array.UNIQUESORT);

trace(arr);

var hash:Dictionary = new Dictionary();

while (i--)

{

        hash[arr[i]] ? arr.splice(i, 1) : hash[arr[i]] = i;

}

trace(arr);