Iterating through object by object's nested element order

Question

Having a very large collection of objects structured like this:

[
  {
    "name": "john",
    "job": "cop",
    "city": "london"
  },
  {
    "name": "mike",
    "job": "nurse",
    "city": "las vegas"
  },
  {
    "name": "kate",
    "job": "teacher",
    "city": "london"
  }
]

I'm trying to iterate through them in order of city. Pseudo-code:

For each city
    print some extra city info
    For each person in city
        print person info
    next
    print some other extra city info
next

I know how to do this in a complicated way; is there a simple one using JQuery?

Could you show the actual data structures, not some generic description of them. Is the collection an array? Use sort to sort it by city, then use jQuery.each() to iterate over them. — Barmar
– Barmar, Commented Jun 3, 2014 at 3:55
@ArunPJohny The way I would do it would be very hacky and long, so I haven't tried it yet (also because I know it WILL work). I'm looking for the simpler/best way to do it. — chris
– chris, Commented Jun 3, 2014 at 7:48
@Barmar Question amended to include the actual data structure — chris
– chris, Commented Jun 3, 2014 at 7:49

Barmar · Accepted Answer · 2014-06-03 07:54:21Z

1

First sort the info by city:

info.sort(function(i1, i2{
    if (i1 < i2) {
        return 1;
    } else if (i1 > i2) {
        return -1;
    } else {
        return 0;
    }
});

Then iterate over the elements, printing the city info whenever it changes.

var last_city = null;
$.each(info, function(i, el) {
    if (el.city != last_city) {
        // print extra city info
    }
    // print person info
    if (el.city != last_city) {
        // print more city info
        last_city = el.city;
    }
});

answered Jun 3, 2014 at 7:54

Barmar

789k57 gold badges555 silver badges669 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

chris Over a year ago

As easy as that. Thank you!

Collectives™ on Stack Overflow

Iterating through object by object's nested element order

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related