lib/methods/a_filter.ts
/** returns boolean */
export type CallBackFilter<T> = (
value: T,
index?: number,
collection?: T[]
) => Promise<boolean>;
/**
* Async Filter function
*
* @export
* @template T
* @param {T[]} elements
* @param {CallBackFilter<T>} cb
* @returns {Promise<T[]>}
*/
export async function aFilter<T>(
elements: T[],
cb: CallBackFilter<T>
): Promise<T[]> {
const filteredResults: T[] = [];
for (const [index, element] of elements.entries()) {
if (await cb(element, index, elements)) {
filteredResults.push(element);
}
}
return filteredResults;
}