The famous guy is named Robin Milner. He created the ML language. In lambda languages like lisp or javascript you can use functions as arguments and return valu

The famous guy is named Robin Milner. He created the ML language. In lambda languages like lisp or javascript you can use functions as arguments and return values. I function-level, or applicative, languages you can only create new functions by combining existing functions. I think. I've never used a function-level language.