[GROOVY-10473] Extend streams support to spread and subscript

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 5.0.0-alpha-1
• Component/s: groovy-jdk
• Assignee: Eric Milles
• Reporter: Eric Milles
• Created: 08/Feb/22 19:34
• Updated: 23/Aug/23 09:11
• Resolved: 28/Jun/22 14:28

Description

Groovy 3 and 4 added some Stream extension methods like plus, toList and toArray. And some default type conversions like String[] array = stream;. This could be taken further by having spread-dot and subscript support:

stream*.thing // --> stream.map(it -> it.thing).toList()
stream[1] // --> stream.skip(1).findFirst().orElse(null)
stream[1..<10] // --> stream.skip(1).limit(10-1).toList()
// consider negative indexes and reverse ranges

Also, forEachPair and zip extension methods would be useful for processing corresponding streams.

Issue Links

• is related to: GROOVY-8133 Static type checking failure for streams and spread operator
• relates to: GROOVY-10476 STC: for-each loop on iterable-like types
• relates to: GROOVY-10666 Implement multiple-assignment (aka destructuring) via getAt(IntRange) or iterator()
• links to: GitHub Pull Request #1733