@graphql-tools/graphql/esm/jsutils/groupBy.js

Fork of GraphQL.js

import { AccumulatorMap } from './AccumulatorMap.js';
/**
 * Groups array items into a Map, given a function to produce grouping key.
 */
export function groupBy(list, keyFn) {
    const result = new AccumulatorMap();
    for (const item of list) {
        result.add(keyFn(item), item);
    }
    return result;
}