Design Patterns and Best Practices in Java

The first/last operator

These methods are used to return the first and last occurrence of an item, based on the given condition. There are blocking versions available too. The available io.reactivex.Observable methods are:

• blockingFirst: Returns the first item emitted by the Observable
• blockingSingle: Returns the first Single item emitted by the Observable
• first: Returns the first item emitted by the Observable
• firstElement: Returns a Maybe that emits only the very first item
• single: Returns a Single that emits only the very first item
• singleElement: Returns a Maybe that emits only the very first Single
• blockingLast: Returns the last item emitted by the Observable
• last: Returns the last item emitted by the Observable
• lastElement: Returns ...