# 8 kyu - Counting sheep... - Authored by tfKamran

Consider an array/list of sheep where some sheep may be missing from their place. We need a function that counts the number of sheep present in the array (true means present).

For example,

`[True,  True,  True,  False,
  True,  True,  True,  True ,
  True,  False, True,  False,
  True,  False, False, True ,
  True,  True,  True,  True ,
  False, False, True,  True]`

The correct answer would be `17`.

Hint: Don't forget to check for bad values like `null/undefined`.