That particular feature came from a language called Self, which was a prototype object based dialect of Smalltalk invented at Xerox PARC in the late 1980s. http

That particular feature came from a language called Self, which was a prototype object based dialect of Smalltalk invented at Xerox PARC in the late 1980s. https://en.wikipedia.org/wiki/Self_(programming_language) https://en.wikipedia.org/wiki/Self_(programming_language) It was one of several big language influences for Brendan Eich when he knocked out Javascript in a hurry a few years later.