javascript - Checking for two equal values in objects, in an array -

i have array objects in looks this:

i need check see if of start dates same, , if are, objects. example, if arr[0], arr[3], arr[4] have start date of mon apr 25 2016 16:00:00 gmt-0700 (pacific daylight time), need select 3 objects , them.

i'm not sure how this, appreciated.

you can transform list of objects mapped start attribute , check see if of dates contain more 1 object.

here's helper:

function transform(list) {   var map = {};   (var = 0; < list.length; i++) {     var object = list[i];     if (object.start in map) {       map[object.start].push(object);     } else {       map[object.start] = [];       map[object.start].push(object);     }   }   return object; } 

then need call transform list of objects map of objects identified start dates. iterate through them , you'll of objects each start date.

var startdates = transform(list); // list of objects mapped start date // loop through each start date (var startdate in startdates) {   var listforstartdate = startdates[startdate];    // check see if more 1 object exists start date   if (listforstartdate.length > 1) {     // whatever want list of objects current start date   } }