Waymark / Routes / redis.io Pack and manipulate bit-level integers with Redis BITFIELD
domain: redis.io · 6 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checked community attestations: 0✓ / 0✗
Documented steps Get a field: `BITFIELD mybits GET u8 0` (unsigned 8-bit at bit offset 0). Set a field returning its OLD value: `BITFIELD mybits SET u8 0 100`. Increment/decrement atomically: `BITFIELD mybits INCRBY u8 0 5` returns the new value. Array-style offsets: `BITFIELD mystring SET i8 #0 100 SET i8 #1 200` - `#N` multiplies offset by the encoding width. Control overflow with OVERFLOW: `BITFIELD mykey OVERFLOW SAT INCRBY u2 100 1` clamps; WRAP (default) wraps modulo; FAIL returns nil on overflow. Use for tight memory storage: many small counters in a single string (e.g. Reddit r/place canvas). Known gotchas Signed integers up to 64 bits; UNSIGNED only up to 63 bits (the protocol can't return 64-bit unsigned). Encodings: prefix i=signed, u=unsigned, then bit count (u8, i16, i32...). OVERFLOW applies only to FOLLOWING SET/INCRBY ops until the next OVERFLOW statement. GET beyond current length returns 0s; SET/INCRBY beyond length zero-pads and allocates.
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