- How can you print something each time an item is emitted?
- How can you compute a value from all the items of an observable?
- How can you subscribe to the latest observable emitted by a higher-order observable?
- How can you combine the values of several observables, item-wise?
- How can you retrieve the first item of an observable?
- How can you classify the items of an observable, based on some criteria?
- How can you drop some elements of an observable, based on some criteria?
- How can you chain several observables, one after the other?
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