Creating an array of cumulative sum in javascript

Question

This is an example of what I need to do:

var myarray = [5, 10, 3, 2];

var result1 = myarray[0];
var result2 = myarray[1] + myarray[0];
var result3 = myarray         


        

Answer 1

Returns sorted obj by key and sorted array!!!

var unsorted_obj = {
  "2016-07-01": 25,
  "2016-07-04": 55,
  "2016-07-05": 84,
  "2016-07-06": 122,
  "2016-07-03": 54,
  "2016-07-02": 43
};

var sort_obj = function(obj){
  var keys = [];
  var sorted_arr = [];
  var sorted_obj = {};

  for(var key in obj){
    if(obj.hasOwnProperty(key)){
      keys.push(key);
    }
  }

  keys.sort();

  jQuery.each(keys, function(i, key){
    sorted_obj[key] = obj[key];
    var val = obj[key];
    sorted_arr.push({
      idx: i,
      date: key,
      val: val
    })
  });

  return { sorted_obj: sorted_obj, sorted_arr: sorted_arr };

};

var sorted_obj = sort_obj(unsorted_obj).sorted_obj;
var sorted_arr = sort_obj(unsorted_obj).sorted_arr;

// sorted_arr = [{"idx":0,"date":"2016-07-01","val":25},{"idx":1,"date":"2016-07-02","val":43},{"idx":2,"date":"2016-07-03","val":54},...]
// sorted_obj = {"2016-07-01":25,"2016-07-02":43,"2016-07-03":54,...}