javascript - Getting a unique array from a service in Angular -


this question has answer here:

i have service contains information members. 1 of variables here team string.

in component, call service method put information in variable before showing in component.

i fill variable "teams" in component unique list of teams in service. should take account writing (so use touppercase()).

my service:

import { injectable } '@angular/core';  @injectable() export class userinfoservice {     //methods or services     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             },         ];     }     //constructor     constructor()     {     } }

my component:

import { component, oninit } '@angular/core'; import { userinfoservice } '../services/userinfo.service';   @component({   selector: 'app-teammembers',   templateurl: './teammembers.component.html',   styleurls: ['./teammembers.component.css'] }) export class teammemberscomponent implements oninit {     //props     teammembers: any[];     teams:any[];      constructor(userinfoservice: userinfoservice)     {         //getdata         this.teammembers = userinfoservice.getmembers();     }                ngoninit() {   } }

with es6, can achieve in 1 line. below example:

this.teams = this.teammembers                  .map(item => item.team)                  .filter((value, index, self) => self.indexof(value) === index)

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