Where to put in a chain of operators?

[dandean]

If I have a property on a component which is an observable, and is derived using a chain of rxjs operators, where should the untilDestroyed(this) operator go in that chain? First? Last?

[Rush]

Last - Source: https://cartant.medium.com/rxjs-avoiding-takeuntil-leaks-fb5182d047ef

The general rule is for takeUntil to be placed last. However, there are some situations in which you might want want use it as the second-last operator.

RxJS includes several operators that emit a value when the source observable to which they are applied completes. For example, when their sources complete, count emits a count of the values emitted by the source and toArray emits an accumulated array of values.

When an observable completes due to takeUntil, operators like count and toArray will only emit a value if they are placed after the takeUntil operator.

Additionally, there is another operator that you should place after takeUntil: the shareReplay operator.

[dandean]

Thanks, @Rush!

[RyannGalea]

This should be on the readme imo.