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[API Proposal]: Linq method for getting value and index #95563
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Tagging subscribers to this area: @dotnet/area-system-linq Issue DetailsBackground and motivationThere is an existing Linq method for returning an enumerable's value and index, but it was added pre-tuples which makes it clunky as it forces the caller to create a type representation for the combination of the value and index, for example using this: IEnumerable<string> lines = GetLines();
foreach (var (line, lineIndex) in lines.Select((l, i) => (l, i)))
{
// ...
} API Proposalnamespace System.Linq;
public static partial class Enumerable
{
public static IEnumerable<(T Value, int Index)> SelectIndex<T>(this IEnumerable<T> source);
}
public static partial class Queryable
{
public static IQueryable<(T Value, int Index)> SelectIndex<T>(this IQueryable<T> source);
} API UsageUsing IEnumerable<string> lines = GetLines();
foreach (var (line, lineIndex) in lines.SelectIndex())
{
// ...
} Alternative DesignsNo response RisksNone.
|
How about |
I also want to point out that name |
How about just This is an extension that I have in almost all the code I write, so I'd love it if it were just ambiently available. |
@eiriktsarpalis that makes sense. Personally, I'd prefer @marklio's suggestion |
Methods starting with |
|
The same method in MoreLinq and SuperLinq is just |
What about |
namespace System.Linq;
public static partial class Enumerable
{
public static IEnumerable<(int Index, T Item)> Index<T>(this IEnumerable<T> source);
}
public static partial class Queryable
{
public static IQueryable<(int Index, T Item)> Index<T>(this IQueryable<T> source);
} |
Background and motivation
There is an existing Linq method for returning an enumerable's value and index, but it was added pre-tuples which makes it clunky as it forces the caller to create a type representation for the combination of the value and index, for example using this:
API Proposal
API Usage
Using
WithIndex
, one can express this idea much more succinctly:Alternative Designs
No response
Risks
None.
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