function getGeneric( arr, idx ) {
	return arr[ idx ];
}
Returns an element from a generic `Array`.

@private
@param {Array} arr - input array
@param {NonNegativeInteger} idx - element index
@returns {*} element value

@example
var arr = [ 1, 2, 3, 4 ];

var v = getGeneric( arr, 2 );
// returns 3