reduce

239 bytes

since v12.1.0

Usage

A reduce that handles callback functions that return a promise.

import * as _ from 'radashi'

const userIds = [1, 2, 3, 4]
const api = {
  users: {
    async find(id: number) {
      return { name: `person ${id}` }
    },
  },
}

const users = await _.reduce(
  userIds,
  async (acc, userId) => {
    const user = await api.users.find(userId)
    return {
      ...acc,
      [userId]: user,
    }
  },
  {},
) // { 1: { name: 'person 1' }, 2: { name: 'person 2' }, 3: { name: 'person 3' }, 4: { name: 'person 4' } }