我想从数组中获取最后 6 个对象

Question

我有一个对象数组列表，我只想返回数组中的最后 7 个对象。请帮助

我尝试使用、过滤、映射和查找，但无法获得预期的输出

var welcomeMessage = [{

    from: "Clement",

    text: "Welcome to Freeborn chat system!",

    id: 0

  },

  {

    from: "mark",

    text: "Hello",

    id: 1

  },

  {

    from: "clement",

    text: "welcome",

    id: 2

  },

  {

    from: "mark",

    text: "long time",

    id: 3

  },

  {

    from: "clement",

    text: "yeah, indeed",

    id: 4

  },

  {

    from: "mark",

    text: "real good to be hear",

    id: 5

  },

  {

    from: "clement",

    text: "you looking good",

    id: 7

  },

  {

    from: "mark",

    text: "Hello",

    id: 8

  },

  {

    from: "clement",

    text: "welcome",

    id: 9

  }

]

const messages = [welcomeMessage]

function latestMessage(messages, search) {

  let search = rquest.body;

  let messages = messages.length - 7

  const messages.filter(message => {

    return message

  })

}

Answer 1

让 lastSeven =welcomeMessage.slice(-7);

Answer 2

上面的答案是正确的，也是最好的解决方案，但是如果您需要使用过滤器，您可以执行以下操作：const items = welcomeMessage.filter((obj, index) => {&nbsp; &nbsp; const arrayLength = welcomeMessage.length;&nbsp; &nbsp; const wantedItems = 6;&nbsp; &nbsp; return arrayLength - index <= wantedItems;});