I read that Ruby inherited many functions from Lisp.
What features of Ruby do the Lisp legacy possibly have?
Good to read: http://www.randomhacks.net/articles/2005/12/03/why-ruby-is-an-acceptable-lisp
And lambdas are in direct parallel: http://snippets.dzone.com/posts/show/6770
See also: βHow Ruby borrowed a long-standing idea from LISPβ http://patshaughnessy.net/2012/9/18/how-ruby-borrowed-a-decades-old-idea-from-lisp
Lambdas, sequels and a list of concepts are likely to be in the top three.