Question

pretty simple question, can’t quite fig. it out.

I have 2 js array’s that I need to combine into a new array, based on sub_key.

var items = [
    Object { 
        OBJECTID=1,
        Name="COMMAND B", 
        ID="AR0xx",
        sub_key="1000"
        },
    Object {
        OBJECTID=2, 
        Name="95TH PCT", 
        ID="AR0xx",
        sub_key="1001"
        },
   Object { 
        OBJECTID=379, 
        Name="dummy4", 
        ID="AR0xx",
        sub_key="9999"
        }
   ];

var subitems = [
   Object { 
       OBJECTID=787, 
       ID="AR0xx", 
       sub_key=1000, 
       Long_Name = foo
       }, 
   Object { 
       OBJECTID=789, 
       ID="AR0xx", 
       sub_key=1001, 
       Long_Name = "bar"
       }, 
   Object { 
       OBJECTID=1, 
       ID="AR0xx", 
       sub_key=1001, 
       Long_Name="baz"
       }, 
   Object { 
       OBJECTID=788,
       ID="AR0xx", 
       sub_key=1001,
       Long_Name="buzzz"
       }
   ];

I’d like to create an array like so, which just combines the above 2, based on sub_key

var data = [
    COMMAND B=["foo"],
    95TH PCT=["bar","baz","buzz"]
    dummy4=[]
    ];

Here’s what I tried but it doesn’t work… i think i’m close?? thanks for any help!

data = [];
for (var key in items){
    var o = items[key];
    //data.push(o.Name);
    for (var subkey in subitems){
        subo = subitems[subkey];
        if (o.sub_key == subo.sub_key){
            data[o.Name].push(subo.Long_Name)
        }
    }
}

Answer 1

Cleaning up your script, here is what you are trying to do. It craetes an array of objects using the Name from items and matching sub_key from sub_items.

var items = [
  { OBJECTID: 1, 
    Name: 'COMMAND B', 
    ID: 'AR0xx', 
    sub_key: '1000' 
  }, 
  { OBJECTID: 2, 
    Name: '95TH PCT', 
    ID: 'AR0xx', 
    sub_key: '1001' 
  }, 
  { OBJECTID: 379, 
    Name: 'dummy4', 
    ID: 'AR0xx', 
    sub_key: '9999' 
  } 
]; 

var subitems = [ 
  { BJECTID: 787,
    ID: 'AR0xx', 
    sub_key: '1000', 
    Long_Name: 'foo' 
  }, 
  { OBJECTID: '789', 
    ID: 'AR0xx', 
    sub_key: '1001', 
    Long_Name: 'bar' 
  }, 
  { OBJECTID: '1', 
    ID: 'AR0xx', 
    sub_key: 1001, 
    Long_Name: 'baz' 
  }, 
  { OBJECTID: '788', 
    ID: 'AR0xx', 
    sub_key: '1001', 
    Long_Name: 'buzzz' 
  } 
]; 

var j = subitems.length;
var result = {};
var p;
var sub_key;
var obj;

for (var i=0, iLen = items.length; i<iLen; i++) {
  p = items[i].Name;
  result[p] = [];
  sub_key = items[i].sub_key;

  for (var j=0, jLen=subitems.length; j<jLen; j++) {

    if (subitems[j].sub_key == sub_key) {
      result[p].push(subitems[j].Long_Name);
    }
  }
}

alert(result['95TH PCT']); // bar, baz, buzz

Edit

Return a single object rather than an array of objects, which I think is what is required.