Function groupBy

  • Groups the elements of an async-iterable sequence and selects the resulting elements by using a specified function.

    Type Parameters

    • TSource

      The type of the elements in the source sequence.

    • TKey

      The type of the grouping key computed for each element in the source sequence.

    Parameters

    • keySelector: ((value) => TKey)

      A function to extract the key for each element.

        • (value): TKey

        • Parameters

          • value: TSource

          Returns TKey

    Returns OperatorFunction<TSource, GroupedIterable<TKey, TSource>>

    A sequence of async-iterable groups, each of which corresponds to a unique key value, containing all elements that share that same key value.

  • Groups the elements of an async-iterable sequence and selects the resulting elements by using a specified function.

    Type Parameters

    • TSource

      The type of the elements in the source sequence.

    • TKey

      The type of the grouping key computed for each element in the source sequence.

    • TValue

      The type of the elements within the groups computed for each element in the source sequence.

    Parameters

    • keySelector: ((value) => TKey)

      A function to extract the key for each element.

        • (value): TKey

        • Parameters

          • value: TSource

          Returns TKey

    • Optional elementSelector: ((value) => TValue)

      A function to map each source element to an element in an async-enumerable group.

        • (value): TValue

        • Parameters

          • value: TSource

          Returns TValue

    Returns OperatorFunction<TSource, GroupedIterable<TKey, TValue>>

    A sequence of async-iterable groups, each of which corresponds to a unique key value, containing all elements that share that same key value.

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