Function prepend

const prependNumbers = prepend([0, 1, 2, 3, 4]);
prependNumbers(["foo", "bar"]); // [0, 1, 2, 3, 4, "foo", "bar"]
Copy

Returns (<TailIterable>(tailIterable) => TailIterable extends IsomorphicIterable<TailItem>
    ? InitialIterable extends IsomorphicIterable<InitialItem>
        ? TailIterable extends {
                [asyncIterator]() => AsyncIterator<TailItem, any, undefined>;
            }
            ? {
                [asyncIterator]() => AsyncIterableIterator<TailItem | InitialItem>;
                next(...args) => Promise<IteratorResult<TailItem | InitialItem, any>>;
                return?(value?) => Promise<IteratorResult<TailItem | InitialItem, any>>;
                throw?(e?) => Promise<IteratorResult<TailItem | InitialItem, any>>;
            }
            : InitialIterable extends {
                    [asyncIterator]() => AsyncIterator<InitialItem, any, undefined>;
                }
                ? {
                    [asyncIterator]() => AsyncIterableIterator<TailItem | InitialItem>;
                    next(...args) => Promise<IteratorResult<TailItem | InitialItem, any>>;
                    return?(value?) => Promise<IteratorResult<TailItem | InitialItem, any>>;
                    throw?(e?) => Promise<IteratorResult<TailItem | InitialItem, any>>;
                }
                : {
                    [iterator]() => IterableIterator<TailItem | InitialItem>;
                    next(...args) => IteratorResult<TailItem | InitialItem, any>;
                    return?(value?) => IteratorResult<TailItem | InitialItem, any>;
                    throw?(e?) => IteratorResult<TailItem | InitialItem, any>;
                }
        : never
    : never)

Curried generator function with initialIterable set in context.

• • <TailIterable>(tailIterable): TailIterable extends IsomorphicIterable<TailItem>
        ? InitialIterable extends IsomorphicIterable<InitialItem>
            ? TailIterable extends {
                    [asyncIterator]() => AsyncIterator<TailItem, any, undefined>;
                }
                ? {
                    [asyncIterator]() => AsyncIterableIterator<TailItem | InitialItem>;
                    next(...args) => Promise<IteratorResult<TailItem | InitialItem, any>>;
                    return?(value?) => Promise<IteratorResult<TailItem | InitialItem, any>>;
                    throw?(e?) => Promise<IteratorResult<TailItem | InitialItem, any>>;
                }
                : InitialIterable extends {
                        [asyncIterator]() => AsyncIterator<InitialItem, any, undefined>;
                    }
                    ? {
                        [asyncIterator]() => AsyncIterableIterator<TailItem | InitialItem>;
                        next(...args) => Promise<IteratorResult<TailItem | InitialItem, any>>;
                        return?(value?) => Promise<IteratorResult<TailItem | InitialItem, any>>;
                        throw?(e?) => Promise<IteratorResult<TailItem | InitialItem, any>>;
                    }
                    : {
                        [iterator]() => IterableIterator<TailItem | InitialItem>;
                        next(...args) => IteratorResult<TailItem | InitialItem, any>;
                        return?(value?) => IteratorResult<TailItem | InitialItem, any>;
                        throw?(e?) => IteratorResult<TailItem | InitialItem, any>;
                    }
            : never
        : never

  • Type Parameters

    • TailIterable extends IsomorphicIterable

    Parameters

    • tailIterable: TailIterable

    Returns TailIterable extends IsomorphicIterable<TailItem>
        ? InitialIterable extends IsomorphicIterable<InitialItem>
            ? TailIterable extends {
                    [asyncIterator]() => AsyncIterator<TailItem, any, undefined>;
                }
                ? {
                    [asyncIterator]() => AsyncIterableIterator<TailItem | InitialItem>;
                    next(...args) => Promise<IteratorResult<TailItem | InitialItem, any>>;
                    return?(value?) => Promise<IteratorResult<TailItem | InitialItem, any>>;
                    throw?(e?) => Promise<IteratorResult<TailItem | InitialItem, any>>;
                }
                : InitialIterable extends {
                        [asyncIterator]() => AsyncIterator<InitialItem, any, undefined>;
                    }
                    ? {
                        [asyncIterator]() => AsyncIterableIterator<TailItem | InitialItem>;
                        next(...args) => Promise<IteratorResult<TailItem | InitialItem, any>>;
                        return?(value?) => Promise<IteratorResult<TailItem | InitialItem, any>>;
                        throw?(e?) => Promise<IteratorResult<TailItem | InitialItem, any>>;
                    }
                    : {
                        [iterator]() => IterableIterator<TailItem | InitialItem>;
                        next(...args) => IteratorResult<TailItem | InitialItem, any>;
                        return?(value?) => IteratorResult<TailItem | InitialItem, any>;
                        throw?(e?) => IteratorResult<TailItem | InitialItem, any>;
                    }
            : never
        : never