flush

        # Zlib::Deflate.flush

(from ruby core)
### Implementation from Deflate
---
    flush(flush = Zlib::SYNC_FLUSH)                 -> String
    flush(flush = Zlib::SYNC_FLUSH) { |chunk| ... } -> nil

---

This method is equivalent to `deflate('', flush)`. This method is just
provided to improve the readability of your Ruby program.  If a block is
given chunks of deflate output are yielded to the block until the buffer
is flushed.

See Zlib::Deflate#deflate for detail on the `flush` constants NO_FLUSH,
SYNC_FLUSH, FULL_FLUSH and FINISH.