Hoon is all about lists, Here are a few examples I have saved for my own personal reference.

|=  [input=tape]
=/  counter  0
=/  results  *(list @t)
|-
?:  =(counter (lent input))
  results
=/  ascii  `@t`(snag counter input)
%=  $
  counter  (add counter 1)
  results  (snoc results ascii)

?:  =(counter (lent input))

get the length of a input and compare to counter

=/  ascii  @t(snag counter input)

using snag pick the counter letter of input. the @t casts this value to a cord (utf-8 text);

%=  $
  counter  (add counter 1)
  results  (snoc results ascii)
==

using %= $ set multiple values (counter and results). snoc concats ascii to results. Both must be the same type list @t