how to show multi array data in my console log - angularjs

Question

i am new in angularjs and mongodb please check below data and code.. i want to show data in console log but its show undefined i don't know why, i was try many times but does not success please guys help me i am very thankful to you please check below code
var current_schedules = this.current.schedule;
if (angular.isArray(current_schedules)) {
for (var j = 0; j < current_schedules.length; j++) {
console.log(current_schedules[j].length);
for (var i = 0; i < current_schedules[j].length; i++) {
console.log(current_schedules[j][i].title);
}
}
}
//MOngodb Data
"schedule" : [
[
{
"_id" : ObjectId("58f76aa9be4d311a78f24f78"),
"sch_end" : ISODate("2017-04-24T00:00:00.000Z"),
"sch_start" : ISODate("2017-04-24T00:00:00.000Z"),
"available" : false,
"title" : "test3"
},
{
"_id" : ObjectId("58f76aa9be4d311a78f24f77"),
"sch_end" : ISODate("2017-04-25T00:00:00.000Z"),
"sch_start" : ISODate("2017-04-25T00:00:00.000Z"),
"available" : false,
"title" : "test4"
},
{
"_id" : ObjectId("58f76aa9be4d311a78f24f76"),
"sch_end" : ISODate("2017-04-27T00:00:00.000Z"),
"sch_start" : ISODate("2017-04-27T00:00:00.000Z"),
"available" : false,
"title" : "test6"
}
],
[
{
"_id" : ObjectId("58f76aa9be4d311a78f24f78"),
"sch_end" : ISODate("2017-04-24T00:00:00.000Z"),
"sch_start" : ISODate("2017-04-24T00:00:00.000Z"),
"available" : false,
"title" : "test9"
},
{
"_id" : ObjectId("58f76aa9be4d311a78f24f77"),
"sch_end" : ISODate("2017-04-25T00:00:00.000Z"),
"sch_start" : ISODate("2017-04-25T00:00:00.000Z"),
"available" : false,
"title" : "test10"
},
{
"_id" : ObjectId("58f76aa9be4d311a78f24f76"),
"sch_end" : ISODate("2017-04-27T00:00:00.000Z"),
"sch_start" : ISODate("2017-04-27T00:00:00.000Z"),
"available" : false,
"title" : "test11"
}
]
]
when i use console.log(current_schedules); its show data