JSFiddle - React, Tailwind, and code Playground

JavaScript

var selectedArray = [{"Id":1,"Order":1,"IsDone":true,"Text":"abc","Date":"6/14/2014"},
 {"Id":2,"Order":2,"IsDone":false,"Text":"cde","Date":"6/15/2014"},
 {"Id":3,"Order":3,"IsDone":false,"Text":"fgh","Date":"6/16/2014"}]



selectedArray = jQuery.grep(selectedArray, function (el) { return el.IsDone == true; });

alert(selectedArray.length);