Immutable Collections is a library containing immutable data structures created by Microsoft for .NET.
Immutable Collections is a library containing immutable data structures created by Microsoft for .NET.
Questions tagged [immutable-collections]
93 questions
3
votes
1 answer
(imutable collection is mutable) returns true in Kotlin
Why this is happening in Kotlin:
val list: List = listOf(1, 2, 3)// Immutable list
if(list is MutableCollection<*>){// why this "if" condition is true?
println("is mutable")// this line is printed
(list as…
ygngy
- 3,630
- 2
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3
votes
0 answers
Should ImmutableSortedSet throw an ArgumentNullException on Contains(null)
I have spent two days chasing down an evil bug. I narrowed down the problem with this test case demonstrating different behavior for different collection classes that implement the same interface. Specifically Contains(null) throws a…
bradgonesurfing
- 30,949
- 17
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3
votes
3 answers
Java 8 collector for Guava Immutable Table
Use case:
Process list of string via method which returns ImmutableTable of type {R,C,V}. For instance ImmutableTable of {Integer,String,Boolean} process(String item){...}
Collect the result i.e, merge all results and return ImmutableTable. Is there…
sidss
- 923
- 1
- 12
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3
votes
3 answers
Creating an ImmutableList of a type that is unknown at compile-time
Given a Collection whose type T is only known in runtime (not at compile time), I would like to generate an ImmutableList.
The method I would like to create may like like:
var immutableList = CreateImmutableList(originalList, type);
where…
SuperJMN
- 13,110
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3
votes
0 answers
Why is ImmutableDictionary implementing IDictionary?
It looks like a weird design choice, because a Dictionary and an ImmutableDictionary are quite different write-wise. (Read-wise, they both implement IReadOnlyDictionary, which is fine*)
In fact, the current implementation of IDictionary
Vincent Ripoll
- 156
- 9
3
votes
1 answer
Looking for usable immutable bool array in C#
I have a class which has an bool array member. If I modify an element of this array, a new modified copy of the instance should be created. Sounds like a perfect opportunity for using an Immutable type. Googling around showed that Microsoft provides…
Johannes
- 1,599
- 1
- 10
- 10
3
votes
3 answers
Make list/collection of objects with public properties truly read-only
I have following problem.
Let's say there is a public Class1 defined like this:
public class Class1
{
public string pr1 { get; set; }
public string pr2 { get; set; }
public Class1()
{
}
}
I'm not allowed to modify class…
plukow
- 31
- 3
2
votes
1 answer
How to cast ImmutableArray to ImmutablyArray and vice versa in C#?
I know it's not possible to cast derived lists (why not is nicely explained here), but what about ImmutableArrays as they cannot be changed casting should be valid, right?
I would expect this to work:
class Animal {}
class Dog : Animal…
DomenPigeon
- 618
- 7
- 12
2
votes
2 answers
What is the difference between ImmutableArray.As and ImmutableArray.CastArray methods?
I'm trying to understand the exact difference between the 3 following methods of the ImmutableArray struct:
the static method ImmutableArray.CastUp
the instance method ImmutableArray.As
the instance method…
Enrico Massone
- 6,464
- 1
- 28
- 56
2
votes
2 answers
Guava - Collect values extracted from two Optionals into an ImmutableSet
I am looking to avoid multiple if-else conditions. Is there a more concise way of writing the below code?
private Set getValues(Optional one, Optional two) {
if (one.isPresent() && two.isPresent()) {
return…
Punter Vicky
- 15,954
- 56
- 188
- 315
2
votes
2 answers
Constructing immutable dictionary with inner immutable dictionary
I have the following dictionary and wish to make it immutable;
var dict = ConcurrentDictionary>
I then call
var immmutableDict = dict.ToImmutableDictionary();
However this would still give the internal…
morleyc
- 2,169
- 10
- 48
- 108
2
votes
3 answers
How to create a fast-call delegate that has parameters and return type of private types, speeding up DynamicInvoke
I'm struggling with creating a call to the private ImmutableDictionary.Add, which allows me to utilize the KeyCollisionBehavior for finer control (the Add method only throws when key and value are different, I need it to throw always).
I can get…
Abel
- 56,041
- 24
- 146
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2
votes
0 answers
How to use ImmutableList<> instead of List<> in Entity Framework 6
In my project, we are using either Entity Framework 6 and the Microsoft's System.Collections.Immutable types nuget package.
We aim to be able to do a query into the Database with EF and the data returned be immutable by default.
Since we have…
Sassa
- 1,673
- 2
- 16
- 30
2
votes
3 answers
How to update value in a nested Immutable map
I am new to immutable.js and trying to figure out a way to update a nested map
Here is my object
let state = OrderedMap({
'name': Map({ id: 'name', hint: 'Search by name', value: '' }),
'job': Map({ id: 'job', hint: 'Search by job title',…
kishore
- 719
- 9
- 29
2
votes
1 answer
C# ImmutableStack Performance
I have a need to use the System.Collections.Immutable ImmutableStack in my code however I have noticed that there has been some performance hit since using it. I was wondering if there is an alternative to this that could provide a better…
ODotN
- 145
- 7