peekable

adjective2

1. •
   Of a stream or other sequence: from which the next value can be retrieved without advancing the pointer from its current position.

   • Peekable streams also have an internal record of their current position and can look ahead in the stream for information. — 2012
2. •
   (informal) Capable of being peeked at or into.

   • Her fourteen dollhouses range in sophistication from a child-made primitive (1887) to an electrified manse set on a low table and peekable from all sides. — 1972