How does yield access the block passed to the method?

Question

Yield seems to be neither object nor method. What is it? How does it access the block that is passed as an argument to the method?

Answer 1

yield is a keyword, just like while or end or return.

"How" it accesses the block is not really interesting, no more than "how" a return keyword delivers a value to the calling context, or "how" an end keyword closes a block - unless you want to dive into development of Ruby interpreter itself. The important bit for a Ruby programmer is just that that's what it does.