Flowtype curry function

flow-curry.js

//@flow

function curry2<A, B, R>(fn : (A, B) => R) : A => B => R {
  return function (a : A) : B => R {
    return function (b : B) : R {
      return fn(a, b);
    };
  };
};
function curry3<A, B, C, R>(fn : (A, B, C) => R) : A => B => C => R {
  return function (a : A) : B => C => R {
    return function (b : B) : C => R {
      return function (c : C) : R {
        return fn(a, b, c);
      };
    };
  };
};