[Proposal]: Collection expressions

[CyrusNajmabadi]

Collection expressions

• Specification: https://github.com/dotnet/csharplang/blob/main/proposals/csharp-12.0/collection-expressions.md
• Discussion: [Proposal]: Collection expressions (VS 17.7, .NET 8) #8651

Summary

Collection expressions introduce a new terse syntax, [e1, e2, e3, etc], to create common collection values. Inlining other collections into these values is possible using a spread operator .. like so: [e1, ..c2, e2, ..c2].

Design meetings

main/meetings/2021/LDM-2021-11-01.md#collection-literals
main/meetings/2022/LDM-2022-03-09.md#ambiguity-of--in-collection-expressions
main/meetings/2022/LDM-2022-09-28.md#collection-literals
main/meetings/2023/LDM-2023-04-03.md#collection-literals
main/meetings/2023/LDM-2023-04-26.md#collection-literals
main/meetings/2023/LDM-2023-05-03.md#collection-literal-natural-type
main/meetings/2023/LDM-2023-05-31.md#collection-literals
main/meetings/2023/LDM-2023-06-05.md#collection-literals
main/meetings/2023/LDM-2023-06-19.md#collection-literals
main/meetings/2023/LDM-2023-07-12.md#collection-literals
main/meetings/2023/LDM-2023-09-18.md#collection-expression-questions
main/meetings/2023/LDM-2023-09-20.md#collection-expressions
main/meetings/2023/LDM-2023-09-25.md#defining-well-defined-behavior-for-collection-expression-types
main/meetings/2023/LDM-2023-09-27.md#collection-expressions
main/meetings/2023/LDM-2023-10-02.md#collection-expressions
main/meetings/2023/LDM-2023-10-11.md#collection-expressions
main/meetings/2023/LDM-2023-11-15.md#nullability-analysis-of-collection-expressions
main/meetings/2024/LDM-2024-01-10.md
main/meetings/2024/LDM-2024-02-26.md#collection-expressions

Working group meetings

main/meetings/working-groups/collection-literals/CL-2022-10-06.md
main/meetings/working-groups/collection-literals/CL-2022-10-14.md
main/meetings/working-groups/collection-literals/CL-2022-10-21.md
main/meetings/working-groups/collection-literals/CL-2023-04-05.md
main/meetings/working-groups/collection-literals/CL-2023-04-28.md
main/meetings/working-groups/collection-literals/CL-2023-05-26.md
main/meetings/working-groups/collection-literals/CL-2023-06-12.md
main/meetings/working-groups/collection-literals/CL-2023-06-26.md
main/meetings/working-groups/collection-literals/CL-2023-08-03.md
main/meetings/working-groups/collection-literals/CL-2023-08-10.md