flex - Populating an array collection by parsing a string -

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in actionscript have string 

str="subject,r1,r2:a,b:1,2:3,4";

dynamically have split string , build array collection given below 

arraycoll.additem({subject:a ,r1:1,r2:3});

this example of 1 set

the arraycollection should built dynamic have tried not successful 

var str:string ="subject,r1,r2:a,b:1,2:3,4"; var parts:array = str.split(":"); var props:array = parts[0].split(","); var count:number = parts[1].split(",").length; var items:array = []; var values:array = []; var i:number, j:number; for(i = 0; < props.length; i++)   values.push(parts[i + 1].split(","));  for(i = 0; < count; i++) {   items.push({});   for(var j = 0; j < props.length; j++)   {     items[i][props[j]] = values[j][i];   } } var arcol:arraycollection = new arraycollection(items);

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