I think you need to be more specific. The word pipe is misleading and not mentioned in the reddit post. The solution in that post is not an operator but a pattern you can implement easily yourself. To be more monadic like it wouldn't be this like in the example
item safeChain recipient; address; street.
Here you need to make sure all messages are chained (using the ; in smalltalk is actually chaining) on the proxy. If the proxy does not return the requested value but again a proxy with that value it would come closer.
But not sure what you meant.
Will Pharo ever get the pipe opeator?
/Garth