是否有必要取消订阅Angular组件中的Redux存储

import { Component,OnInit } from '@angular/core';

@Component({
    moduleId: module.id,selector: 'selector',templateUrl: 'name.component.html'
})
export class ComponentNameComponent implements OnInit {
    private unsubscribe : Function;

    constructor(@Inject(AppStore) private store: Store<AppState>) {}

    ngOnInit() {
        this.unsubscribe = this.store.subscribe ( ()=>{ this.updateFromState(); });
    }
    // Is unsubscribing onDestroy necessary?
    ngOnDestroy(){
        this.unsubscribe();
    }

    this.updateFromState(){
        // ...
    }
}

所以我想知道我是否应该总是取消订阅商店,如果我没有,会发生什么.