SISMEMBER(3valkey)

📦
version 9.0.6 · 2 versions
, in fedora 44

💖 SISMEMBER 💖

ok so this is a page from the Valkey Command Manual, bestie, and we're talking about SISMEMBER — the girl who does one (1) job and does it flawlessly. no cap. let's get into it 🎀

✨ NAME ✨

sismember — tells you whether a member belongs to a set. that's it. that's the whole gig. she's not complicated, she's just reliable 💅

🌸 SYNOPSIS 🌸

SISMEMBER key member

two args. in, out. iconic behavior honestly 🦋

🧚 DESCRIPTION 🧚

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

literally that's it. you hand her a key and a member, she tells you if that member is in the set. no drama, no side quests, no "let me think about it". 🫶

⭐ REPLY ⭐

One of the following, so pay attention bestie:

  • valkey-protocol(7) Integer reply: 0 if the element is not a member of the set, or when the key does not exist.
  • valkey-protocol(7) Integer reply: 1 if the element is a member of the set.

so basically 1 = she's in, 0 = she's not (and also 0 if the key straight-up doesn't exist — yes, missing key and "not in the set" look the same from here, that's just how she rolls 🙈).

🔥 COMPLEXITY 🔥

O(1)

constant time, babes. one lookup, no matter how thicc the set is. main character efficiency 💀✨

💜 ACL CATEGORIES 💜

@fast @read @set

three little badges and she earned every one of them 👑

🎀 HISTORY 🎀

  • Available since: 1.0.0

she's been here since 1.0.0. an OG. a founding mother. respect her 🫡💖

🌈 EXAMPLES 🌈

here's the whole vibe in action, copy it, paste it, slay it:

127.0.0.1:6379> SADD myset "one"
(integer) 1
127.0.0.1:6379> SISMEMBER myset "one"
(integer) 1
127.0.0.1:6379> SISMEMBER myset "two"
(integer) 0

see how "one" got a 1 and "two" got a 0? that's the entire plot. ate and left no crumbs 🍓

🦋 SEE ALSO 🦋

her whole friend group, go say hi:

ok that's the whole page, bestie 💖 this one came from Valkey 9.0.0, dated 2025-10-21, and it was a SISMEMBER(3valkey) situation from start to finish. go check your sets, mwah 🎀✨💅

📦 where this page comes from