javascript - 无法在字符串 'and_chr 89' 上创建属性 'and_ff'"

Question

Lambda 函数出现问题，收到错误，但如果我在快速应用程序中运行相同的代码，我不会收到相同的错误。我不是

Data returned by caniuse.getLatestStableBrowsers();
[
  'and_chr 89',        'and_ff 86',
  'and_qq 10.4',       'and_uc 12.12',
  'android 89',        'baidu 7.12',
  'bb 10',             'chrome 89',
  'edge 89',           'firefox 87',
  'ie 11',             'ie_mob 11',
  'ios_saf 14.0-14.5', 'kaios 2.5',
  'op_mini all',       'op_mob 62',
  'opera 73',          'safari 14',
  'samsung 13.0'
]

我遇到问题的Lamda代码

'use strict';
const caniuse = require('caniuse-api');
const request = require('request');

const browsers = caniuse.getLatestStableBrowsers();
const versions = browsers.reduce((memo, bro) => {
    const parts = bro.split(' ');
    memo[parts[0]] = parts[1];
    return memo;
    });
    console.log(versions);

运行良好的快速代码

'use strict'
const express = require('express');
const caniuse = require('caniuse-api');
const app = express();

app.use(express.json());

app.get('/', (req, res) => {
  const browsers = caniuse.getLatestStableBrowsers();
  const versions = browsers.reduce((memo, bro) => {
    const parts = bro.split(' ');

    memo[parts[0]] = parts[1];

    return memo;
  }, {});

  res.send({ versions });
});

Answer 1

数组 reducer 方法缺少初始值，而在 express 代码中定义了初始值。

'use strict';
const caniuse = require('caniuse-api');
const request = require('request');

const browsers = caniuse.getLatestStableBrowsers();
const versions = browsers.reduce((memo, bro) => {
    const [browser, version] = bro.split(' ');
    memo[browser] = version;
    return memo;
}, {});
console.log(versions);