my take at an if-else in BrainF**k . Checks for input of '5'

ifelse.bf

// accept input
, // at cell 1

// subtract ascii '5' (53) from input
>++++++++++[<----->-]<--- // at cell 1

// if inp == '5'
>+ // set zero flag to 1 (cell 2)
>+< // set else flag to 1
<[>-<[-]] // change zero flag if inp not '5' (at cell 1)

// runs if zero flag 1
>[
  [-] // zero cell 2 out
  <[-] // zero cell 1 out
  // load ascii 'Y' (89)
  >++++++++++ // load counter for 10 at cell 2
  [<+++++++++>-]<- // 10 * 9 = 90 minus 1 = 89
  . // print
  >>-< // go unset else flag and return to cell 2
]

> // go check else flag
[
  [-] // zero ourself out
  // load ascii 'N' (78) 10 * 8 minus 2
  >++++++++++ // load counter with 10
  [<++++++++>-]<--
  . // print 'N'
  >
]