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    Function findIndex

    • Finds the index of the first item whose async predicate resolves to true. Returns -1 if no item matches.

      Type Parameters

      • I

        The input item type.

      Parameters

      • data: I[] | Promise<I[]>

        Input array, or a promise that resolves to one.

      • predicate: (item: I, token: CancellableToken) => Promise<boolean>

        Async predicate to evaluate.

      • Optionaloptions: FindIndexOptions

        Configuration options including cancellation and concurrency.

      Returns CancellableHandle<number>

      A cancellable handle resolving to the matched index or -1.

      const handle = findIndex(
        [1, 2, 3, 4],
        async (item, token) => {
          await token.sleep(10);
          return item > 2;
        },
      );

      const index = await handle; // 2

    • Finds the index of the first item whose async predicate resolves to true. Returns -1 if no item matches.

      Type Parameters

      • I

        The input item type.

      Parameters

      • data: CollectionInput<I> | Promise<CollectionInput<I>>

        Input array, or a promise that resolves to one.

      • predicate: (item: I, key: string | number, token: CancellableToken) => Promise<boolean>

        Async predicate to evaluate.

      • Optionaloptions: FindIndexOptions

        Configuration options including cancellation and concurrency.

      Returns CancellableHandle<number>

      A cancellable handle resolving to the matched index or -1.

      const handle = findIndex(
        [1, 2, 3, 4],
        async (item, token) => {
          await token.sleep(10);
          return item > 2;
        },
      );

      const index = await handle; // 2

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