如何 map 按所需 object 值分组的嵌套 arrays 数组

Question

我有一组消息，如下所示：

[
  { message: 'This is message', to: 4, from: 1},
  { message: 'This is response message', to: 1, from: 4 },
  { message: 'This is ANOTHER message with different sender', to: 1, from: 2 },
  { message: 'This is RESPONSE message to different sender', to: 2, from: 1 },
]

我有所有的消息，但它们没有按用户对用户的对话分组。 我想要的是通过to和from对消息（在数组内）进行分组。

我怎样才能达到以下结果：

[
  [
    { message: 'This is message', to: 4, from: 1},
    { message: 'This is response message', to: 1, from: 4 },
  ],
  [
    { message: 'This is ANOTHER message with different sender', to: 1, from: 2 },
    { message: 'This is RESPONSE message to different sender', to: 2, from: 1 }
  ],
]

简而言之：

目前的结构是

// Individually structured messages
[message, message, message, message]

期望的结果：

// Grouped by user-to-user conversation
// [[Conversation1], [Conversation2]]
[[message, message], [message,message]]

我曾尝试将 lodash 与return this._.values(this._.groupBy(this.messages, 'to')) ，但由于我需要按两个标准对它们进行分组，所以我没能想出逻辑。

Answer 1

Javascript 使用Array.reduce和Array.find实现

 const messages = [ { message: 'This is message', to: 4, from: 1}, { message: 'This is response message', to: 1, from: 4 }, { message: 'This is ANOTHER message with different sender', to: 1, from: 2 }, { message: 'This is RESPONSE message to different sender', to: 2, from: 1 }, ]; const groupedMessage = messages.reduce((acc, curr) => { const node = acc.find(item => item.find((msg) => (msg.from === curr.to && msg.to === curr.from) || (msg.from === curr.from && msg.to === curr.to))); node? node.push(curr): acc.push([curr]); return acc; }, []); console.log(groupedMessage);