SETNX
Set a key's value only if it does not exist.
SETNX key valueComplexity
O(1)
Complexity and compatibility are read out of kevy's implementation, not copied from Redis's reference. Several genuinely differ.
Redis compatibility
Compatible
Behaves as Redis does.
See also
APPENDDECRDECRBYGETGETDELGETSETINCRINCRBYINCRBYFLOATMGETMSETPSETEXSETSETEXSTRLEN