Question 1

How to prepend an element to a Java stream using StreamEx?

Accepted Answer

Use the prepend() method on StreamEx instances. For example, StreamEx.of(users).map(User::getName).prepend("(none)").toList() adds a default option to a list, as shown in the README examples.

Question 2

StreamEx vs standard Java streams: which is better for performance?

Accepted Answer

StreamEx is designed with minimal overhead and often matches or exceeds standard stream performance, especially in parallel processing. However, for trivial cases, the difference may be negligible, and standard streams avoid extra dependencies.

Question 3

How to process map entries with StreamEx in Java?

Accepted Answer

Use EntryStream.of(map) to create a stream of map entries, then apply methods like flatMapValues, invert, or grouping. The README shows examples for inverting maps or converting key-value pairs.

Question 4

Does StreamEx work with Java 11 or later?

Accepted Answer

Yes, StreamEx is compatible with Java 8 and later versions, including Java 11, as it maintains 100% JDK stream compatibility. However, its feature set is based on Java 8's API.

Question 5

StreamEx or Vavr for functional streams in Java?

Accepted Answer

StreamEx focuses on enhancing Java streams with utility methods and better interoperability, while Vavr offers a full functional library with immutable collections. Choose StreamEx for stream-specific improvements and Vavr for broader functional programming.

Question 6

How to handle primitive types like short or float in StreamEx?

Accepted Answer

Use IntStreamEx with methods like toShortArray() for short arrays or similar approaches for other primitives. The README provides an example of multiplying a short array using toShortArray().

StreamEx

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