takeWhile for fun and for profit

component_takeWhile.ts

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

import { MyService } from './MyService.ts';

import 'rxjs/add/operator/takeWhile';

@Component({
  selector: 'my-rad-component',
})
export class MyComponent implements OnInit, OnDestroy {

  /* A boolean for monitoring the destruction of the component. */
  private isDestroyed: boolean = false;

  /* Inject a service with an observable API. */
  constructor(private myService: MyService) { }

  ngOnInit() {
    this.myService.getData() /* Fetch some data. */
      .takeWhile( () => !this.isDestroyed ) /* Take events as long as we are not destroyed. */
      .subscribe( data => {
        // do something with your data, AKA: define your effects.
      });
  }

  ngOnDestroy() {
    this.isDestroyed = true; /* Update our state. */
  }
}