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+Returns the score of `member` in the sorted set at `key`.
+
+If `member` does not exist in the sorted set, or `key` does not exist, `nil` is
+returned.
+
+@return
+
+@bulk-string-reply: the score of `member` (a double precision floating point
+number), represented as string.
+
+@examples
+
+```cli
+ZADD myzset 1 "one"
+ZSCORE myzset "one"
+```