A lot of those concepts were already in Smalltalk. a do: [:x| Transcript print: x ] [] = closure That is, because Smaltalk was based on Lisp. But th

A lot of those concepts were already in Smalltalk. a do: [:x| Transcript print: x ] [] = closure That is, because Smaltalk was based on Lisp. But the other OO languages removed this concept, but it came back in Scala.