| ScanByTSource, TKey, TState(IEnumerableTSource, FuncTSource, TKey, FuncTKey, TState, FuncTState, TKey, TSource, TState) | Applies an accumulator function over sequence element keys, returning the keys along with intermediate accumulator states. |
| ScanByTSource, TKey, TState(IEnumerableTSource, FuncTSource, TKey, FuncTKey, TState, FuncTState, TKey, TSource, TState, IEqualityComparerTKey) | Applies an accumulator function over sequence element keys, returning the keys along with intermediate accumulator states. An additional parameter specifies the comparer to use to compare keys. |