@serenity-js/core/src/io/asyncMap.ts

The core Serenity/JS framework, providing the Screenplay Pattern interfaces, as well as the test reporting and integration infrastructure

/**
 * Maps an Array<Item_Type> to an Array<Result_Type>, one element at a time.
 *
 * @param items
 * @param mappingFunction
 */
export function asyncMap<Item_Type, Result_Type>(items: Item_Type[], mappingFunction: (item: Item_Type) => Promise<Result_Type> | Result_Type): Promise<Result_Type[]> {
    return Promise.resolve().then(() => items.reduce(
        (previous, item) =>
            previous.then(async (acc) => {
                const result = await mappingFunction(item);

                acc.push(result)

                return acc;
            })
        , Promise.resolve([])
    ));
}