Sort and merge JSON keys with matching values

Question

My JSON looks like this:

json = [
  {
    type: \"big\"
    date: \"2012-12-08\"
    qty: 6
  }
  {
    type: \"small\"
    date: \"2012-12-08\"
    qty: 9
  }
          


        

Answer 1

Alternative solution:

var result = [];

$(json).each(function (i, e){
    var search = $.grep(result, function(elm){ return e.type == elm.type && e.date.substring(0, 7) == elm.date; });
    if(search.length == 0)
        result.push({ type: e.type, date: e.date.substring(0, 7), qty: e.qty });
    else
        search[0].qty += e.qty;
});