That's a nice improvement on my suggestion because it doesn't require a second loop. But since you only care about the key, not the value, that you put into newArrayHashMap, I wouldn't burden the memory manager and the garbage collector by constructing a new Object() for each value; using a scalar value like 1 or true would be more efficient. But this will only matter if the status array will be large.
Also, if "All" gets sorted alphabetically along with the other status codes, will users know it's special? - Gordon -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of turbo_vb Sent: Wednesday, April 12, 2006 2:21 PM To: [email protected] Subject: [flexcoders] Re: AS3 Array Question Doug and Gordon, thanks for the advise. I decided on the following solution. public function populateStatusArray(array:Array):void { var newArrayHashMap : Object = new Object(); var status : Array = new Array; status.push("All"); var n:int = array.length; for (var i:int = 0; i < n; i++) { if (newArrayHashMap[array[i].status] == undefined) { newArrayHashMap[array[i].status] = new Object(); status.push(array[i].status); } } status.sort(); ModelLocator.getInstance().statusArray = status; } Tim Hoff --- In [email protected], "Gordon Smith" <[EMAIL PROTECTED]> wrote: > > You can use a plain Object as a Set... see the code below. > > You first put key/value pairs into the Object, but it makes no > difference what the values are. You just care about the keys, and the > Object's hash table takes care of ensuring that setting a key more than > once is harmless. > > Then you iterate over the Object, pulling out the unique keys into an > Array that can be sorted. > > Finally, you stick "All" at the top, after the sort. > > - Gordon > > > <?xml version="1.0" encoding="utf-8"?> > <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; width="600" > height="600"> > > <mx:Script> > <![CDATA[ > > [Bindable] > private var array:Array = [ "B", "C", "A", "B", "A", "D" > ]; > > public function getUniqueItems(array:Array):Array > { > var uniqueItemHash:Object = {}; > var n:int = array.length; > for (var i:int = 0; i < n; i++) > { > uniqueItemHash[array[i]] = true; > } > > var uniqueItemArray:Array = []; > for (var p:String in uniqueItemHash) > { > uniqueItemArray.push(p); > } > > uniqueItemArray.sort(); > uniqueItemArray.unshift("All"); > return uniqueItemArray; > } > > ]]> > </mx:Script> > > <mx:ComboBox dataProvider="{getUniqueItems(array)}"/> > > </mx:Application> > > -----Original Message----- > From: [email protected] [mailto:[EMAIL PROTECTED] On > Behalf Of Doug Lowder > Sent: Tuesday, April 11, 2006 5:00 PM > To: [email protected] > Subject: [flexcoders] Re: AS3 Array Question > > For large arrays, it will be more efficient to do this: > > 1) Make a copy of the input array, if necessary > 2) Sort the array by status > 3) Iterate through the array once, storing new status values and > skipping the duplicates > > > --- In [email protected], "turbo_vb" <TimHoff@> wrote: > > > > I'm trying to populate a dataProvider array for a comboBox that > > contains unique status values from another array, that is used as > > the dataProvider for a dataGrid. The comboBox is used to filter > the > > dataGrid. The code below works, but I seem to remember seeing > this > > done somewhere that doesn't use nested for statements. Does > anyone > > know how I can identify if the array's status value already exists > > in the new status array without iterating the new array every time? > > > > public function populateStatusArray(array:Array):void { > > > > var status : Array = new Array; > > status.push("All"); > > > > var n:int = citations.length; > > for (var i:int = 0; i < n; i++) { > > var m:int = status.length; > > var found:Boolean = false; > > for (var j:int = 0; j < m; j++) { > > if (status[j] == array[i].status){ > > found = true; > > } > > } > > if (found == false) { > > status.push(array[i].status); > > } > > } > > status.sort(); > > ModelLocator.getInstance().statusArray = > status; > > } > > > > Thank You, > > Tim Hoff > > > > > > > > > -- > Flexcoders Mailing List > FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt > Search Archives: > http://www.mail-archive.com/flexcoders%40yahoogroups.com > Yahoo! Groups Links > -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com Yahoo! Groups Links -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/flexcoders/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
