Is there a way to check to body parts of a creep?

[Geners]

I want my creeps to attack healers first if there is any in range but in order for me to do that I need to be able to find some array that holds a list of their body parts. Does any such member variable exist within the creeps object?

[TheNumberOne]

http://support.screeps.com/hc/en-us/articles/203013212-Creep#body

[nugarin]

yes
creep.body;
count MOVE parts:

var c = aquireCreep();
_.filter(c.body, function(bp){return bp == MOVE;}).length;