APPENDAppend bytes to a string value; returns the new length.
| Syntax | APPEND key value |
| Group | string |
| Arity | 3 |
| Since | 1.0.0 |
| Flags | write |
| Complexity | O(1) amortised while the value is <= 64 B; O(N) per call once it exceeds that (the Arc payload is copied out and re-boxed on every append), so building a large string by repeated APPEND is O(N^2) |
| Redis compatibility | full |