Question

I have a request that returns a JSON object with a single property which is an array. How can I test if the array is empty?

With jQuery code like:

 $.getJSON(             jsonUrl,             function(data) {                 if (data.RoleOwners == [ ]) {                     $('<tr><td>' + noRoleOwnersText + '</td></tr>').appendTo('#roleOwnersTable tbody');                     return;                 }                 $.each(data.RoleOwners, function(i, roleOwner) {                     var tblRow =                     '<tr>'                     + '<td>' + roleOwner.FirstName + '</td>'                     + '<td>' + roleOwner.LastName + '</td>'                     + '</tr>'                     $(tblRow).appendTo('#roleOwnersTable tbody');                 }); 

what can I put instead of if(data.RoleOwners == [ ]) to test if the RoleOwners is an empty array?

Thanks, Matt

Answer 1

(data.RoleOwners.length === 0)