ES6 为多个数组运行不同的函数

Question

我有一个sendEmail函数需要根据用户在数组中的位置发送不同的电子邮件。例如，我有以下数据：[   { download: 'Release sale. 50% off!',    user: '[e-mail]' },  { download: 'Release sale. 50% off!',    user: '[e-mail]' },  { download: 'Release sale. 50% off!',    user: '[e-mail]' },  { download: 'Release sale. 50% off!',    user: '[e-mail]' } ][   { download: 'Test',    user: '[e-mail]'   } ]对于每个数组，我需要累积所有user电子邮件和download字符串并运行以下函数：await transporter.sendMail({    from: '"Test" <[e-mail]>',    to: [email array here],    subject: "Here is your file",    text: `Here is your download: ${download}`  })

Answer 1

您可以将数组组合成一个数组并对其进行迭代，sendMail()为每个元素调用您的方法。

const users1 = [{

    download: 'Release sale. 50% off!',

    user: '[e-mail]'

  },

  {

    download: 'Release sale. 50% off!',

    user: '[e-mail]'

  },

  {

    download: 'Release sale. 50% off!',

    user: '[e-mail]'

  },

  {

    download: 'Release sale. 50% off!',

    user: '[e-mail]'

  }

];

const users2 = [{

  download: 'Test',

  user: '[e-mail]'

}];

const allUsers = [...users1, ...users2];

const groupedUsers = allUsers.reduce((acc, u) => {

  const group = acc.find(x => x.download === u.download);

  if (group) {

    group.users.push(u.user);

    return acc;

  }

  return [...acc, {

    download: u.download,

    users: [u.user]

  }];

}, []);

console.log(groupedUsers)

使用groupedUsers上面的列表，您应该能够根据download属性向用户组发送电子邮件。

groupedUsers.forEach(async group => {

  await transporter.sendMail({

    from: '"Test" <[e-mail]>',

    to: group.users,

    subject: "Here is your file",

    text: `Here is your download: ${group.download}`

  });

});

我使用了 spread ( ...) 运算符来组合数组，但concat()如果您愿意，也可以使用。const allUsers = users1.concat(users2);