object array Group by an element?

Question

Please see this example: JsFiddle

Question: I have the following JSON Array

y= [ {\"LngTrend\":15,\"DblValue\":10,\"DtmStamp\":13582260         


        

Answer 1

You can build a sparse array, indexed by DtmStamp.

var x = [];
$.each(y, function(i, obj) {
    var s = obj.DtmStamp;
    if(!x[s]) x[s] = [];
    x[s].push(obj.DblValue);
});

//x is now a sparse array, indexed by DtmStamp

This has the advantage over an object, that the array elements are in DtmStamp order.

//To loop through x
for(i in x) {
    ...
}