which is the most difficult programming language in the world?
['Malbolge. Malbolge is one of the toughest programming languages. ... ', 'Cow Programming Language. A cow programming language is released sometime in early 2013. ... ', 'Brainfuck. Brainfuck is an esoteric programming language introduced in 1993 by Urban Muller. ... ', 'INTERCAL. ... ', 'Whitespace.']