I think the 1977 Icon language is where the generator concept originated. It had many other cool features I have not seen in other languages since: https://en.w

I think the 1977 Icon language is where the generator concept originated. It had many other cool features I have not seen in other languages since: https://en.wikipedia.org/wiki/Icon_(programming_language)# https://en.wikipedia.org/wiki/Icon_(programming_language)#