await redis.sadd("key", "a", "b", "c"); 
const cardinality = await redis.scard("key");
console.log(cardinality); // 3

​
Arguments

​
key
string
required
The key of the set.

​
Response

How many members are in the set.
await redis.sadd("key", "a", "b", "c"); 
const cardinality = await redis.scard("key");
console.log(cardinality); // 3