Immutable collections
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Definition
An immutable collection is a collection of instances that
- preserves its structure all the time: no addition or removal of elements, no change of order
- disallows element-level assignments
While still offering APIs to perform mutations: Add, Remove, ...
The immutable collections are designed with two goals in mind:
- reuse as much memory as possible, to avoid copying, and to reduce pressure on the garbage collector
- support the same operations offered by mutable collections with competitive time complexities
Immutable Stacks
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var s1 = ImmutableStack<int>.Empty; // call push, s1 remains unchanged, and it returns a reference to the resulting immutable stack which contains the element 1. var s2 = s1.Push(1); // call push, s2 remains unchanged, and it returns a reference to the resulting immutable stack which contains no element. // s3 and s1 target the same reference: s3 == s1 var s3 = s2.Pop(); |
Other immutable collection types:
- Immutable Lists
- Immutable Arrays
- Immutable Dictionaries
