Sorting by FirstName not working in JavaScript

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This is my JSON response, how would i sort it. What i tried. I am parsing my JSON response, then taking it an Array OBJ and the tryin to sort. The results are same even after sorting too.

var PatientSearchData = JSON.parse(PatientSearchResponse);
    var results = PatientSearchData['PatientSearchResult'];
    alert("OLD Result" +results.Patient)
    results.Patient.sort(function(a,b){
        var nameA = a.Firstname.toLowerCase();
        var nameB = b.Firstname.toLowerCase();
        if(nameA < nameB) 
        return -1;
        if(nameA > nameB) 
        return 1
        return 0
   })
   alert("Sorted One" +results.Patient)

Updated Code

function formatData(data){    
  var output = [];    
  for(var i=0, len=data.length; i<len; i++){        
    output.push(data[i].Firstname);    
  }
    return output.join("\n");
}

function RenderPatientSearchData(PatientSearchResponse){
    var PatientSearchData = JSON.parse(PatientSearchResponse);
    var results = PatientSearchData['PatientSearchResult'];
    results.Patient.sort(function(a,b){
           var nameA = a.Firstname.toLowerCase();        
           ar nameB = b.Firstname.toLowerCase();        
           return nameA < nameB ? -1 : nameA > nameB : 0
        })
    rowData = [];
    var prevHeader = ' ';
    for (i = 0, len = results.Patient.length; i < len; i++) {
        var PatientFirstName = results.Patient[i].Firstname;

What do i get combining the firstname alone

[INFO] /TiAPI ( 802): 4261 FirstName
[INFO] /TiAPI ( 802): Migration Test
[INFO] /TiAPI ( 802): Bo
[INFO] /TiAPI ( 802): Mark
[INFO] /TiAPI ( 802): Kevin
[INFO] /TiAPI ( 802): Scott
[INFO] /TiAPI ( 802): John
[INFO] /TiAPI ( 802): Dagwood
[INFO] /TiAPI ( 802): Clyde

---

It works for me, except the part where you try to debug by displaying the raw array inside an alert. Try this instead:

function formatData(data){
    var output = [];

    for(var i=0, len=data.length; i<len; i++){
        output.push(data[i].Firstname);
    }

    return output.join("\n");
}
[...]
alert("OLD Result:\n" + formatData(results.Patient));
[...]
alert("Sorted One:\n" + formatData(results.Patient));

---

It may be malformatted JSON?
Your sort function is working.

The result you get to see using results.Patients are something like:
[object Object],[object Object], ...
I suppose?

Try iterating through the results.Patient array before and after, and check the console:

for (var i=0;i<results.Patient.length;i++){
   console.log(results.Patient[i].Firstname);
}

Furthermore, your sort function can also be written as:

function(a,b){
        var nameA = a.Firstname.toLowerCase();
        var nameB = b.Firstname.toLowerCase();
        return nameA < nameB ? -1 : nameA > nameB : 0
});