Question

How do I convert testObj to an array?

function MinEvent(event, width, left){
  this.start = event.start;
  this.end = event.end;
  this.width = width;
  this.top = event.start;
  this.left = left;
}

var testObj = {};
for (var j=0; j<eventLists.length; j++) {
  var eve = eventLists[j];
  var event = new MinEvent(eventList[j], width, left);
  testObj[eve.id] = event;
}

Answer 1

Technically every object in javascript can be treated like an array. Your code should work as-is.

But either way, looking at your code, why not define testObj as var testObj = [];?