Join multiple strings into one single string

I have a loop that is generating a string

function jsonResponse(response)
{
    var singleString = a + "," + b + "," + c + "|";
}

with console.log(singleString);

I see them all generated :

a1,b1,c1|
a2,b2,c2|
a3,b3,c3|

But how can I create a new variable allStrings that will concatenate all of these into one string? The loop is part of an ajax response that is looping through xml nodes to retrieve the data for those variables. I guess I need to make them part of an array and then join them back together for one big string?

To further clarify what I am trying to achieve is something like :

  var allStrings = singleString[0] + singleString[1] + singleString[2] ;

    a1,b1,c1|a2,b2,c2|a3,b3,c3|

To better explain the loop it looks like this :

$j.ajax({
    type: "GET",

    url: "test.xml",
    dataType: "xml",
    success:   function  parseXml(data)
    {
        $j('.loader').fadeOut();
        itemQueue = $j(data).find("ITEM").map( function ()
            {
                return {
                        date: $j("LAST_SCAN" , this).text(),
                        type : $j("PRODUCT_TYPE", this).text(),
                        cat : $j("CLASS_NAME", this).text(),
                        };  
            }).get();
            getNextItem();  

        }
    });

function getNextItem()
    {    
        var item = itemQueue[0];
        var singleString = item.date+ "," + item.type +  "," + item.cat + "\n";
        console.log( singleString );

        $j.ajax({
            url: s7query,
            dataType: 'jsonp'
        });
      }

function s7jsonResponse(response)
{
    var item = itemQueue.shift();
    if (itemQueue.length)
    {
        getNextItem();  
    }
    // run other processes when finished with checks
    if (!itemQueue.length)
    {   
        // alert ("ALL DONE");
    }
}

                    
                    
                        
                        javascript
                        
                        arrays
                        
                        string
                        
                    
                    
                        
                        
                        
                        
                        
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Join multiple strings into one single string

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