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• keyValMap.js

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node_modules.graphql.jsutils.keyValMap.js Maven / Gradle / Ivy

"use strict";

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

/**
 *  Copyright (c) 2015, Facebook, Inc.
 *  All rights reserved.
 *
 *  This source code is licensed under the BSD-style license found in the
 *  LICENSE file in the root directory of this source tree. An additional grant
 *  of patent rights can be found in the PATENTS file in the same directory.
 */

/**
 * 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));
}