Is there a concise way to iterate over a stream with indices in Java 8?

Question

Is there a concise way to iterate over a stream whilst having access to the index in the stream?

String[] names = {\"Sam\",\"Pamela\", \"Dave\", \"Pascal\",          


        

Answer 1

In addition to protonpack, jOOλ's Seq provides this functionality (and by extension libraries that build on it like cyclops-react, I am the author of this library).

Seq.seq(Stream.of(names)).zipWithIndex()
                         .filter( namesWithIndex -> namesWithIndex.v1.length() <= namesWithIndex.v2 + 1)
                         .toList();

Seq also supports just Seq.of(names) and will build a JDK Stream under the covers.

The simple-react equivalent would similarly look like

 LazyFutureStream.of(names)
                 .zipWithIndex()
                 .filter( namesWithIndex -> namesWithIndex.v1.length() <= namesWithIndex.v2 + 1)
                 .toList();

The simple-react version is more tailored for asynchronous / concurrent processing.