4 ms·

x +- y = (x + x) - (y + y) That's crazy. I should learn Haskell (again).

• mlevental 9y ago
  what exactly is crazy about this?
  • runeks 9y ago
    The simplicity with which a new operator is defined.
    • cygned 9y ago
      This. Incredible elegant. I always enjoy these types of things when programming Lisp.
    • akhilcacharya 9y ago
      I think this is a downside. It just makes reading new code that uses esoteric symbols defined elsewhere.
      • gilmi 9y ago
        This[0] operator glossary reviews the most used operators. [0]: https://haskell-lang.org/tutorial/operators https://haskell-lang.org/tutorial/operators
• Tehnix 9y ago
  `+-` here is an entirely new operator though. The shuffling of arguments might look a bit weird though, it could also be written (+-) x y = (x + x) - (y + y) Symbol operators are automatically infix though, and you can make them normal using (), same as backticks make normal functions infix, `a la 2 `plus` 3.