[angular 2] Is it necessary to dispose of Observable subscriptions in ngOnDestroy()?

[Brian Kotek]

One thing that I'm not clear on is whether I'm required to manually dispose Observable subscriptions I set up in a component.

For example say I do this in ngOnInit():

this.someService.somethingChanged.subscribe( ( value ) => this.onSomethingChanged( value ) );

Am I required to store that subscription and manually dispose() of it in ngOnDestroy()? And if I fail to do this, am I introducing a memory leak?

Thanks,

Brian

[Günter Zöchbauer]

When the components class isn't referenced anywher anymore it will be garbage collected and your subscription with it (when no other class holds a reference to it)