如何在angular2中处理可观察类型的数据

Question

I am new angular2 so please ignore if you find it the basic question.

I have a variable of type Observable

users: Observable<User[]>;

and in the constructor, I am filling it

constructor(private roleService: RoleService, private userService: UserService) {
        this.users = this.userService.getAllUsers();
}

Now I want to manipulate/iterate the data of this.users . How can I do that?

Answer 1

You can use map or any other of the long list of available operators.

You need to subscribe to execute the observable, otherwise it won't do anything. You can also use .forEach(...) , .toArray() , (and others) instead of subscribe() :

constructor(private roleService: RoleService, private userService: UserService) {
        this.users = this.userService.getAllUsers()
        .map(val => val + 'xxx')
        .subscribe(val => console.log(val));
}

See also https://blog.thoughtram.io/angular/2016/01/06/taking-advantage-of-observables-in-angular2.html