code: function countHolders(array, placeholder) {
  	  var length = array.length,
  	      result = 0;
  
  	  while (length--) {
  	    if (array[length] === placeholder) {
  	      result++;
  	    }
  	  }
  	  return result;
  	}
docs: Gets the number of `placeholder` occurrences in `array`.
  
  @private
  @param {Array} array The array to inspect.
  @param {*} placeholder The placeholder to search for.
  @returns {number} Returns the placeholder count.