Deconstructing Scalaz <**>

Question

Can someone with better knowledge help me understand how Scalaz <**> and co. works ? I'm new to Scalaz and little bit lost in exploring.

What I want to do is accumulate errors within List something like (v0 <**> v1) foldLeft(l: List[Validation[A,B]) (_ :: _ :: l)

Answer 1

为了解决我的问题，我发现liftFailNel有帮助（ https://github.com/scalaz/scalaz/blob/master/example/src/main/scala/scalaz/example/ExampleValidation.scala ）但我仍然没有掌握所有问题这里发生的魔力。