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) => {

    const arrayLength = welcomeMessage.length;

    const wantedItems = 6;

    return arrayLength - index <= wantedItems;

});