week3

week3/assignment_3a.hoon

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+:: Hoon 101: Assignment 3a. Comment each line of code to tell the reader what the code is doing.
+:: Comments should be written as "breathing comments" as suggested in the Hoon Style Guide: https://urbit.org/docs/learn/hoon/style/
+
+:: create a gate, with the sample @ud, given the face n
+::
+|=  n=@ud
+:: attach a 't' faced @ud to the subject, with the value 1
+::
+=/  t=@ud  1
+:: create and execute a gate, such that we can recurse back to this point
+::
+|-
+:: if n is 1, return the next child, otherwise the one after
+::
+?:  =(n 1)
+:: at the end, return our total
+::
+    t
+:: otherwise recurse with n minus one,
+:: and t multiplied by n. note t is
+:: not reset with the recurse, as it
+:: is attached before our recurse point
+::
+$(n (dec n), t (mul t n))

week3/week3.hoon

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+|=  a=(list *)
+=/  n=@ud  3
+|-
+?~  a  ~
+?:  =(1 n)
+  i.a
+$(n (dec n), a t.a)
+