How to filter from a sharepoint list on get ajax request?

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Ajax

REST

WebAPI

SharePoint2010

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I have a list of names and have saved them in an array.
then i am passing the array to a get ajax function as a parameter to return the required info.

what i am trying to achieve is to filter that list based on the values in the array.

I tried using filter as show below but it is not return anything and if i remove the filter it returns everything in the list:

url: "https://mysite/_api/EmployeeInfo?$filter=FullName eq'" + dataarray+ "'",


I have shown my function below please help as i am not very familiar with how to go about this. any help is greatly appreciated.

What I have tried:

function getEmployeeDetails(id) {
   console.log(id);

    var dataarray=JSON.stringify(id);

       var dfd = $.Deferred();
       $.ajax({

           url: "https://mysite/_api/EmployeeInfo?$filter=FullName eq'" + dataarray+ "'",

           data:JSON.stringify(id) ,
            type: "GET",
           dataType: "json",
           headers: {
               "accept": "application/json;odata=verbose"
           },
           success: function(data) {
               dfd.resolve(data);
               console.log(data);
           },
           error: function(data, errCode, errMessage) {
               {
                   swal('Error', 'Item not found', 'error')
               }
           }
       });
       return dfd.promise();

   }