[1]: http://stackoverflow.com/questions/8063325/usefulness-as-in-practical-applications-of-currying-v-s-partial-application-i [2]: http://www.vaikan.com/currying-partial-application/ [3]: http://www.codecommit.com/blog/scala/function-currying-in-scala [4]: https://book.douban.com/subject/26772149/ [5]: https://www.coursera.org/learn/progfun1/lecture/fOuQ9/lecture-2-2-currying