function arrayFilter(array, predicate) {
	      var index = -1,
	          length = array.length,
	          resIndex = -1,
	          result = [];

	      while (++index < length) {
	        var value = array[index];
	        if (predicate(value, index, array)) {
	          result[++resIndex] = value;
	        }
	      }
	      return result;
	    }
A specialized version of `_.filter` for arrays without support for callback
shorthands and `this` binding.

@private
@param {Array} array The array to iterate over.
@param {Function} predicate The function invoked per iteration.
@returns {Array} Returns the new filtered array.