Array iteration with async/await, Multi-dimensional array flattening, Object generation from Array with es6, remove duplicates from array of large objects

CoolJavaScriptCode.js

import { map } from 'p-iteration';
import _uniqBy from 'lodash/uniqBy';

/* Array iteration with async/await */
const getMultipleCategoryProducts = async productCategories => {
  return map(productCategories, async category => {
    const products = await getProductsByCategory(category);
    return products;
  });
};
   
filteredProds = await getMultipleCategoryProducts(productCategories);
   
/* flatten mutli-dimensional Array */
filteredProds = [].concat(...filteredProds);
   
/* generate Object from array for O1 constant lookup */
const excluded = Object.assign(
   ...productsExclude.map(productId => ({ [productId]: true })),
);

/* filter products using Object above */
filteredProds = filteredProds.filter(
  product => !excluded[product.productId],
);

/* make sure products are unique */
filteredProds = _uniqBy(filteredProds, (p) => p.productId);