README

Counting sheep

Consider an array 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

Source