Programming

29,212 readers

2,795 active

111 users here now

Welcome to the main community in programming.dev! Feel free to post anything relating to programming here!

Cross posting is strongly encouraged in the instance. If you feel your post or another person's post makes sense in another community cross post into it.

Hope you enjoy the instance!

Rules

Follow the programming.dev instance rules
Keep content related to programming in some way
If you're posting long videos try to add in some form of tldr for those who don't want to watch videos

Wormhole

Follow the wormhole through a path of communities !webdev@programming.dev

founded 3 years ago

moderation log

moderators

snowe@programming.dev

Ategon@programming.dev

UlrikHD@programming.dev

bugsmith@programming.dev

Spyro@programming.dev

What are some cool and obscure data structure you know of? (programming.dev)

submitted 10 months ago by protein@programming.dev to c/programming@programming.dev

58 comments fedilink hide all child comments

you are viewing a single comment's thread
view the rest of the comments

[–] idunnololz@lemmy.world 7 points 10 months ago (3 children)

I personally don't think it's that obscure but I have never seen this used in production code that I didn't write: the linked hash map or ordered hash map.

permalink

fedilink

source

hideshow 3 child comments

[–] 3abas@lemmy.world 2 points 10 months ago

I've used it twice that I can recall.

permalink

fedilink

source

parent

[–] jesale@mastodon.social 1 point 10 months ago (1 child)

@idunnololz @protein what's the goal of an ordered hashmap?

permalink

fedilink

source

parent

hideshow 1 child comment

[–] mcmodknower@programming.dev 2 points 10 months ago

Having a fixed iteration order, but an amortized O(1) access time.

For example if you have a map of uuids to players in a game, and want to use the same map for doing operations to all of them in the order they joined.

permalink

fedilink

source

parent