SISMEMBER

Check if a member exists in a set

Returns if member is a member of the set stored at key.

Usage

await redis.sismember(key, member);

Parameters

key · string · required

The key of the set

member · TData · required

The member to check for existence in the set

Response

result · 0 | 1

Returns 1 if the member exists in the set, 0 otherwise

Examples

Check if member exists

await redis.sadd("myset", "hello", "world");
const exists = await redis.sismember("myset", "hello");
console.log(exists); // 1

Check for non-existing member

await redis.sadd("myset", "hello", "world");
const exists = await redis.sismember("myset", "foo");
console.log(exists); // 0

Using in conditionals

const isMember = await redis.sismember("users:premium", "user:123");
if (isMember === 1) {
  console.log("User has premium access");
} else {
  console.log("User does not have premium access");
}

Check membership with custom types

await redis.sadd("numbers", 1, 2, 3, 4, 5);
const exists = await redis.sismember("numbers", 3);
console.log(exists); // 1