+Counting sheep.js

/*Description:

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
*/
function countSheeps(arrayOfSheep) {
  // TODO May the force be with you
  var count = 0;
  for(var i=0; i<arrayOfSheep.length; i++)
  {
      if(arrayOfSheep[i] == true) count++;
  }
  return count;
}