从Angular中的服务获取一个唯一数组

我有一个包含成员信息的服务。其中一个变量是团队字符串。\n在我的组件中，我调用服务方法将信息存入一个变量中，然后在组件中展示该信息。\n我想要用服务中团队的唯一列表来填充组件中的变量\"teams\"。这应该考虑到大小写（所以我会使用toUpperCase()）。\n我的服务：\n

import { Injectable } from '@angular/core';
@Injectable()
export class UserinfoService
{
    //方法或服务
    getMembers()
    {
        return [
            {
                imageUrl: "../assets/images/filler.jpg",
                firstName: "filler",
                lastName: "filler",
                team: "TEAM A",
                number: "+123456798",
                bio: "Lorem ipsum dolor sit amet,...",
                isActive: true
            },
            {
                imageUrl: "../assets/images/filler.jpg",
                firstName: "filler",
                lastName: "filler",
                team: "TEam A",
                number: "+123456798",
                bio: "Lorem ipsum dolor sit amet,...",
                isActive: false
            },
            {
                imageUrl: "../assets/images/filler.jpg",
                firstName: "filler",
                lastName: "filler",
                team: "TEAM B",
                number: "+123456798",
                bio: "Lorem ipsum dolor sit amet,...",
                isActive: true
            },
        ];
    }
    //构造函数
    constructor()
    {
    }
}

\n我的组件：\n

import { Component, OnInit } from '@angular/core';
import { UserinfoService } from '../services/userinfo.service';
@Component({
  selector: 'app-teammembers',
  templateUrl: './teammembers.component.html',
  styleUrls: ['./teammembers.component.css']
})
export class TeammembersComponent implements OnInit
{
    //属性
    teammembers: any[];
    teams:any[];
    constructor(userinfoService: UserinfoService)
    {
        //获取数据
        this.teammembers = userinfoService.getMembers();
    }            
  ngOnInit() {
  }
}