Ruby (and most languages) evaluates the arguments before passing them through to the function. So it first evaluates server.accept, which blocks until a new con

Ruby (and most languages) evaluates the arguments before passing them through to the function. So it first evaluates server.accept, which blocks until a new connection, then passes the return value through to Thread.new which spawns the new thread. The parameters to Thread.new are just passed straight through to the block.