graphql/jsutils/keyValMap.js

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = keyValMap;


/**
 * Creates a keyed JS object from an array, given a function to produce the keys
 * and a function to produce the values from each item in the array.
 *
 *     const phoneBook = [
 *       { name: 'Jon', num: '555-1234' },
 *       { name: 'Jenny', num: '867-5309' }
 *     ]
 *
 *     // { Jon: '555-1234', Jenny: '867-5309' }
 *     const phonesByName = keyValMap(
 *       phoneBook,
 *       entry => entry.name,
 *       entry => entry.num
 *     )
 *
 */
function keyValMap(list, keyFn, valFn) {
  return list.reduce(function (map, item) {
    return map[keyFn(item)] = valFn(item), map;
  }, Object.create(null));
} /**
   * Copyright (c) 2015-present, Facebook, Inc.
   *
   * This source code is licensed under the MIT license found in the
   * LICENSE file in the root directory of this source tree.
   *
   * 
   */