map-style operator in Jac for Jaseci objects

[ypkang]

Would be cool to be able to, in one line, apply a function to a set of jaseci objects (nodes, edges), similar to map in python.

For example, to get the value of a has variable of all nodes in a collection.
Something like

node item {
   has name;
   has count;
}
...
walker init {

  items = --> node::item;
  item_names = items.name; # item_name would be just an array of strings
  map(items, here.count+=1); # obviously this syntax won't work but the idea is this will increment count in every item in the set.
}