/** @private */
export function map(array, mapper) {
return Promise.all(array.map(mapper));
}
/** Invoke a list (object or array) of functions, returning their results in the same structure.
* @private
*/
export function resolve(list) {
let out = Array.isArray(list) ? [] : {};
for (let i in list) if (list.hasOwnProperty(i)) out[i] = list[i]();
return out;
}
/** reduce() callback that pushes values into an Array accumulator
* @private
*/
export async function pushReducer(acc, v) {
acc.push(await v());
return acc;
}
/**
* Base `map` to invoke `Array` operation **in parallel**.
* @private
* @param {String} operation The operation name of `Array` to be invoked.
* @return {Array} resulting mapped/transformed values.
*/
export function baseMap(operation) {
return async (array, predicate) => {
let mapped = await map(array, predicate);
return array[operation]( (v, i) => mapped[i] );
};
} |