Proposal: add Join overload that returns a valueTuple #28747
Description
Similar to the Zip proposed in #20167 it would be useful to have a Join overload that returns a valueTuple.
A very simple implementation (but one that isn't good enough) would be:
public static IEnumerable<(T1, T2)> Join<T1, T2, TKey>(
this IEnumerable<T1> left,
IEnumerable<T2> right,
Func<T1, TKey> leftKey,
Func<T2, TKey> rightKey)
=> left.Join(right, leftKey, rightKey, ValueTuple.Create);It could then be used like this:
foreach(var (a, b) in listA.Join(listB, a => a.Id, b => b.Id))
{
// ...
}