Animation Group Order Using animation nodes I was able to make a procedural animation of a bridge made up of tiles coming from above and forming said bridge. 

I created it by taking a plane, subdividing it 10 times, separating the faces, made them separate objects and added them to a group. 
I use said group in a loop subprogram for the animation.

The issue arises when the tiles come in, they come in at a weird order. I wanted to know if there is a way to control the order of which the tiles(objects) come in? Is that possible or would I have to connect hundred of objects in the correct order in an object list. 

Thank you for your time!
First of all, blender group is not reliable as objects order. 

Otherwise, you need a fixed location of objects as a reference for sorting by location.
Given that they are moving around you have to consider only the final position (landed) for sorting.

This goes 2 ways:


you use instancer to copy same object. Here you need to sort the vectors positions (vector list) that give the location of objects (instances), and not the objects
if have a list/group of objects that are different, you have to use id key node (object submenu) to get the initial rot/loc . But first, make sure you set initial transforms (in 3d view, AN panel) for all objects.
This is slightly different and I'll not detail here.


I will detail the first case

For the examples below I use the template Grid Arrange. 


Just use the grid order
This goes naturally if u use the respective template or similar.





Use a distance to object to sort
In comparison to above, use a vector/ vector distance node to compare each position to an empty (or something else)





U can further use some expressions
U can do the same by sorting the vector (landed positions) first
as distance to or as direction as shown in the pics with formula:


distance to:

sorted(list, key = lambda item: (item - point).length_squared, reverse = reversed)


direction:

sorted(list, key = lambda item: item.dot(direction), reverse = reversed)


where the inputs are: a vector list, a vector, a boolean





Please note that in all these case I basically sort the vectors, not the objects. 
For the other case, you would sort the objects based on the list of (id key ) initial locations.