C#•3y ago

✅ Comparing properties of a values of lists

Livid · 2023-10-09T09:34:09.171Z

i have 2 lists `List ` and `List ` and both `Animal` and `Dog` have the property `id` i'm trying to insert a list of `Dog` into the list of `Animal` but i don't want to insert Animals with duplicate `id`'s

i have 2 lists

List<Animal>

List<Animal>

List<Animal>

List<Animal> and

List<Dog>

List<Dog>

List<Dog>

List<Dog>

and both

Animal

Animal

Animal

Animal and

Dog

Dog

Dog

Dog have the property

id

id

i'm trying to insert a list of

Dog

Dog

Dog

Dog into the list of

Animal

Animal

Animal

Animal
but i don't want to insert Animals with duplicate

id

id

NinjaOla•10/9/23, 9:37 AM

paste this question into chatgpt. and i think u will be happy with your answer

NinjaOla•10/9/23, 9:37 AM

also bonus: ask it to explain

Pobiega•10/9/23, 9:37 AM

List<Dog> dogs = new List<Dog>();
List<Animal> animals = new List<Animal>();

List<Dog> dogsNotInAnimals = ...;

animals.AddRange(dogsNotInAnimals);

List<Dog> dogs = new List<Dog>();
List<Animal> animals = new List<Animal>();

List<Dog> dogsNotInAnimals = ...;

animals.AddRange(dogsNotInAnimals);

Pobiega•10/9/23, 9:38 AM

can you think of a way to calculate dogsNotInAnimalsdogsNotInAnimals?

LividOP•10/9/23, 9:38 AM

i mean might there be a performance issue if

List<Animal>

List<Animal>

is quite big

Pobiega•10/9/23, 9:39 AM

sure, but then you shouldn't be having a list in the first place

NNinjaOla paste this question into chatgpt. and i think u will be happy with your answer

LividOP•10/9/23, 9:39 AM

but then i won't be improving my explanation skills

NNinjaOla paste this question into chatgpt. and i think u will be happy with your answer

Thinker•10/9/23, 10:16 AM

don't do that lmao

TThinker don't do that lmao

NinjaOla•10/9/23, 10:18 AM

Now i wonder eiter my skills are bad or i got something else from it than you?

Thinker•10/9/23, 10:19 AM

wat

LividOP•10/9/23, 10:19 AM

wat

Pobiega•10/9/23, 10:19 AM

wat

NinjaOla•10/9/23, 10:24 AM

Ask chatgpt for an explaination and solution

Thinker•10/9/23, 10:25 AM

If you're gonna tell someone to just go ask a text prediction engine then why even respond in the first place? This person asked a question, you gave them a non-answer

Thinker•10/9/23, 10:25 AM

If they wanted to use chatgpt then they would've done that

NinjaOla•10/9/23, 10:25 AM

Ah then i understand

Thinker•10/9/23, 10:25 AM

they asked a question here

NinjaOla•10/9/23, 10:25 AM

I think its a tool that is often not looked at, so

Thinker•10/9/23, 10:25 AM

it's looked at too much lmao

LividOP•10/9/23, 10:26 AM

i know how to do it

LividOP•10/9/23, 10:26 AM

however

Pobiega•10/9/23, 10:26 AM

Don't.

LividOP•10/9/23, 10:26 AM

i was asking if there is a better way than looping

Pobiega•10/9/23, 10:26 AM

Plenty

PPobiega Plenty

LividOP•10/9/23, 10:26 AM

gimme

Pobiega•10/9/23, 10:26 AM

Assuming we can change some types around

Pobiega•10/9/23, 10:26 AM

if you are working with two lists, there isnt much we can do

Pobiega•10/9/23, 10:27 AM

Can you think of a collection type that could be used to help with the "unique id" requirement?

LividOP•10/9/23, 10:27 AM

wat

Pobiega•10/9/23, 10:28 AM

what part of that question made you go wat?

PPobiega Can you think of a collection type that could be used to help with the "unique i...

LividOP•10/9/23, 10:28 AM

wat

Pobiega•10/9/23, 10:28 AM

so I know what to explain

LividOP•10/9/23, 10:28 AM

collection type?

Pobiega•10/9/23, 10:29 AM

List<T>List<T> is a collection type

Pobiega•10/9/23, 10:29 AM

T[]T[] (array) is also a collection type

Pobiega•10/9/23, 10:29 AM

can you name some more?

LividOP•10/9/23, 10:29 AM

why T?

Pobiega•10/9/23, 10:29 AM

its just a placeholder for the actual type

LividOP•10/9/23, 10:29 AM

Pobiega•10/9/23, 10:29 AM

by convention we use the letter T for that

LividOP•10/9/23, 10:30 AM

hashmap

Pobiega•10/9/23, 10:30 AM

Yep!

LividOP•10/9/23, 10:31 AM

dictionary

Pobiega•10/9/23, 10:31 AM

yep!

LLivid hashmap

Pobiega•10/9/23, 10:31 AM

called

HashSet

HashSet

in C#, but its the same

LividOP•10/9/23, 10:31 AM

oh yes

Pobiega•10/9/23, 10:31 AM

so what do hashsets and dictionaries have as their "special" property?

LividOP•10/9/23, 10:31 AM

no duplicate?

Pobiega•10/9/23, 10:32 AM

thats hashsets, yes

Pobiega•10/9/23, 10:32 AM

dictionaries are keyed