[Closed] Create an Ik Chain – what I am missing?

I really appreciate your help.
It works like a champ now! And as a result, my script is much more simplified compared to what I had at the begining.
Here is the result:

fn createIkChains sel =
   (
   	
   	 maxops.CloneNodes sel expandHierarchy:true cloneType:#copy newNodes:&chain
   	 chain.wireColor = (color 196 88 225)
   	 
   	 for bone in chain do
   	 (
   		 bone.width += 1.5
   		 bone.height += 1.5
   		 bone.name += "_IK"
   		 IkHandle = IKSys.ikChain bone bone.children[1] "IKHiSolver"
   -- 		format "IkHandle: %
" IkHandle
   		
   		IkHandleName = ("IKChain_" + (substring bone.name 1 (bone.name.count-3)))
   		if IkHandle != undefined then IkHandle.name = IkHandleName
   	 )
    )
   createIkChains $

The only question that remains is this weird thing that “IkHandle” gives me… on the second occurrence of the loop, it always output undefined. If you un-comment the format line, you’ll see what I mean.
I had to add a check on IkHandle to rename it only if its not undefined.

   Hey David,
   That's because it is the last bone in the chain and it has no children. 

format "IkHandle:% bone:% children:% 
" IkHandle bone.name bone.children[1]

   I have updated your function to avoid undefined children: 

fn createIkChains sel =
       (
       	maxops.CloneNodes sel expandHierarchy:true cloneType:#copy newNodes:&chain
        
       	for bone in chain where (children = bone.children[1]) != undefined do
       	(
       		IkHandle = IKSys.ikChain bone children "IKHiSolver"
       		IkHandle.name = "IKChain_" + bone.name
      	)
       
       	chain.wireColor = (color 196 88 225)
       	chain.width  += 1.5
       	chain.height += 1.5
       	chain.name += "_IK"
 	return chain
       )
    

Thats great! It works very well.

That’s because it is the last bone in the chain and it has no children.
That is what I was thinking, just not knowing why it always occurs at the second occurrence in the loop instead of at the last one.

   I like the way you di it.  I makes me see how much I still have to learn to write better scripts :D.
   Like this part, I would never  have thought of doing it this way:

for bone in chain where (children = bone.children[1]) != undefined do

  I would probably had come up with this:

	for bone in chain do
      	(
      		if bone.children[1]) != undefined then
      		(
      			IkHandle = IKSys.ikChain bone children "IKHiSolver"
      			IkHandle.name = "IKChain_" + bone.name
      		)
      	)

You see how your way is definitely better than mine ;).

Thanks