How to count object values using javascript -


i have object arrays inside. arrays grouped 'sku'. , should count object values inside grouped sku's. if there farbigkeit, proof or eindruck count them how apear , sum quan.

fiddle: https://jsfiddle.net/tokadmwn/2/

    <pre id="result"></pre>

javascript:

var mydata = [     { sku: "9017wks43dp", quan: 100, farbigkeit: "a90zukos4599", proof: "a90zukos4499" },     { sku: "9017wks18dp", quan: 100 },     { sku: "9017was18dp", quan: 50, eindruck: "a90zukos4799" },     { sku: "9017was18dp", quan: 40, eindruck: "a90zukos4799", proof: "a90zukos4499" },     { sku: "9017wks43dp", quan: 200, farbigkeit:"a90zukos4699", proof: "a90zukos4499" },     { sku: "9017wks43dp", quan: 200, farbigkeit:"a90zukos4599" } ];  function groupby(propertyname, array) {     var groupedelements = {};      for(var = 0; < array.length; i++) {         var element = array[i];                      var value = element[propertyname];         var quantity = element['quan'];          var group = groupedelements[value];         if(group == undefined) {             group = [element];             groupedelements[value] = group;         } else {             group.push(element);         }     }     return groupedelements; }  var result = groupby("sku", mydata); console.log(result); $("#result").html(json.stringify(result, null, 4));

without jquery:

function aggr(data) {     var res={};     mydata.foreach(function(item){         res[item.sku]=res[item.sku]||{quan:0};         res[item.sku].quan+=1*item.quan;         ["farbigkeit","proof","eindruck"].foreach(function(p) {             res[item.sku][p]=(res[item.sku][p]?res[item.sku][p]:0)+(item[p]?1:0);         })     });     return res; }

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