knockout.js - KnockoutJS Appending To the Beginning of observableArray -

i have viewmodel retrieve data server , new data concatenated data have. problem is, new data goes after old data , want other way around fresh data shows @ top of view.

this have:

self.serverdata(self.serverdata().concat(newdata)); 

and view displayed as:

1. old data
2. old data
3. old data
4. new data

prepend observable arrays using unshift function. modify underlying array , tell observable updated.

var x = ko.observablearray([1,2,3]); x.unshift(0); // x() returns [0,1,2,3]