How to merge two arrays of JSON objects - removing duplicates and preserving order in Javascript/jQuery?

Question

jsfiddle link: http://jsfiddle.net/vN6fn/1/

Assume I have these 2 objects:

var obj1 = { data: [ 
                      {id:1, commen         


        

Answer 1

You can use $.merge and then go through and remove duplicates, and then sort it.

$.merge(obj1.data, obj2.data);

var existingIDs = [];
obj1.data = $.grep(obj1.data, function(v) {
    if ($.inArray(v.id, existingIDs) !== -1) {
        return false;
    }
    else {
        existingIDs.push(v.id);
        return true;
    }
});

obj1.data.sort(function(a, b) {
    var akey = a.id, bkey = b.id;
    if(akey > bkey) return 1;
    if(akey < bkey) return -1;
    return 0;
});