Recursive function for Angular.js to determine if an array of objects contains duplicates

checkForDuplicateObjects.js

    /**
     * [checkForDuplicateObjects recursively checks an array of objects for duplicate values using angular.equals() to deeply compare objects.]
     * @param  {[array]} _array [the array of objects to be checked]
     * @return {[boolean]} true or falsey [the function will return true if duplicates are found]
     */
    function checkForDuplicateObjects(_array) {
      if (_array.length > 1) {
        var first = _array[0];
        
        for (var i = 1; i < _array.length; i++) {
          if (angular.equals(first, _array[i])) {
            return true;
          }
        }

        _array.shift();
        return checkForDuplicateObjects(_array);
      }
    }