Must check to decide whether this current iteration in a loop is the last

[doofenstein]

for an arbitrary iterator that's not possible unless you first save the results 
of every iteration into a seq.

Though say if you iterate about a seq, you can do this:
    
    
    for i, item in pairs mySeq:
      if i == mySeq.len-1:
        echo "last"
    
    
    Run

or if you iterate over a table:
    
    
    var i = 0
    for k, v, in pairs myTable:
      if i == myTable.len-1:
        echo "last"
      i += 1
    
    
    Run