Sorted Set
ZADD
Add a member to a sorted set, or update its score if it already exists.
Arguments
key
string
requiredThe key of the sorted set.
options
xx
boolean
Only update elements that already exist. Never add elements.
nx
boolean
Only add new elements. Never update elements.
ch
boolean
Return the number of elements added or updated.
incr
boolean
When this option is specified ZADD acts like ZINCRBY. Only one score-element pair can be specified in this mode.
Response
The number of elements added to the sorted sets, not including elements already existing for which the score was updated.
If ch was specified, the number of elements that were updated.
If incr was specified, the new score of member.
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