javascript - Adding new element to the object based on the comparison -

i have following objects:

var empary= [{"empid":"101","name":"david"},{"empid":"102","name":"sam"}..];//2000 records  var empary2= [{"empid":"101","name":"david"},{"empid":"105","name":"kevin"},{"empid":"109","name":"robert"},{"empid":"110","name":"rob"}..];//30000 records 

i need add new element empary object , populate new element value based on availability of particular record in empary2.

expected output:-

empary= [{"empid":"101","name":"david", **"founinempary2":"yes"**},{"empid":"102","name":"sam", **"founinempary2":"no"}**..];//2000 records 

if can jquery good. please me.

it's hard make sense of founinempary2 since object structures identical in both samples. assume other properties exist , use jquery $.extend() "merge" properties.

first efficient loop through big array once , create object using empid keys.

var tmp = {}; $.each( empary2, function(_, item){     tmp[ item.empid ] = item; }); 

this creates object like:

{      "101" : {"empid":"101","name":"david"},     "102" : {"empid":"102","name":"sam"} } 

now loop through first array , extend whatever in matching object in tmp object

$.each( empary, function(_, item){     $.extend( item, tmp[ item.empid ]); }); 

reference: $.extend() docs