How can i create sql-like AS3 ArrayCollection grouping - actionscript-3

Question

I have an arrayCollection which I created dynamically like one at bottom:
arrCol = ({"ID":ids[i][0], "Price":ids[i][1], "OtherInfo":ids[i][2]});
I want to group data and summarise Price by ID.
If this ArrayCollection was a SQL table, I could use a query like this:
SELECT ID, SUM(Price), OtherInfo
FROM TableA
GROUP BY ID
So how can I set an AS3 function like the query example in SQL or is there any native ArrayCollection class for this?

Answer 1

Try this, there is no built in function available for your need(sum,groupby) so we need to do manually below code will help you.
var arrCol:ArrayCollection = new ArrayCollection();
arrCol.addItem({"ID":1, "Price":100, "OtherInfo":"info"});
arrCol.addItem({"ID":1, "Price":700, "OtherInfo":"info"});
arrCol.addItem({"ID":2, "Price":100, "OtherInfo":"info"});
arrCol.addItem({"ID":2, "Price":200, "OtherInfo":"info"});
arrCol.addItem({"ID":3, "Price":100, "OtherInfo":"info"});
arrCol.addItem({"ID":3, "Price":400, "OtherInfo":"info"});
arrCol.addItem({"ID":3, "Price":100, "OtherInfo":"info"});
var dic:Dictionary = new Dictionary();
for each (var item:Object in arrCol)
{
if(!dic[item.ID]){
dic[item.ID] = item;
}
else{
var oldSumObj:Object = dic[item.ID];
oldSumObj.Price +=item.Price;
dic[item.ID] = oldSumObj;
}
}
var groupedList:ArrayCollection = new ArrayCollection();
for each (var itemObj:Object in dic)
{
groupedList.addItem(itemObj);
}
output will be:
"groupedList" mx.collections.ArrayCollection (#27af939)
[0] Object (#8836569)
ID 1
OtherInfo "info"
Price 800 [0x320]
[1] Object (#87a7c71)
ID 2
OtherInfo "info"
Price 300 [0x12c]
[2] Object (#87a7bc9)
ID 3
OtherInfo "info"
Price 600 [0x258]

Answer 2

While you can't make SQL type queries in AS3, you can use its bevy of methods to achieve the same result.
// Work with an array. Child elements must be an associative array (structure/object/hash-table)
var ac:Array = [
{"name":"apple", "price":100, "color":"red"},
{"name":"banana", "price":50, "color":"yellow"},
{"name":"pear", "price":250, "color":"green"},
]
// Apply the order your want based on the property you're concerned with.
ac.sortOn("price", Array.ASCENDING)
// If necessary, create a subset of that array with the "select"-ed columns.
var output:Array = [];
for each (var entry:Object in ac) {
output.push({entry.name, entry.color});
}
// Printing output will result in
// 0:{"name":"banana", "color":"yellow"},
// 1:{"name":"apple", "color":"red"},
// 2:{"name":"pear", "color":"green"}