Paul King created GROOVY-11596:
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Summary: Additional DGM lazy iterator methods
Key: GROOVY-11596
URL: https://issues.apache.org/jira/browse/GROOVY-11596
Project: Groovy
Issue Type: Improvement
Reporter: Paul King
Assignee: Paul King
This issue is to provide a few more iterator variants in the DGM methods. Some
of these methods already exist but have an eager implementation. Others are
inspired from [groovy-stream|https://timyates.github.io/groovy-stream/].
Instead of being executing in multiple seconds, as is, the following code
executes in a few 10s of ms with the iterator line uncommented, and creates
much fewer intermediate collections.
{code:groovy}
assert (1..10000)
// .iterator()
.repeat(10000)
.take(20000000)
.takeWhile{ true }
.drop(5)
.collate(2)
.flatten{ it * 2 }
.dropRight(1)
.dropWhile{ it < 15 }
.withIndex()
.init()
.take(5)
.injectAll([0, 0]){ a, b -> [a.first() + b.first(), a.last() + b.last()] }
.collect()
.toString() == '[[16, 0], [34, 1], [54, 3], [76, 6], [100, 10]]'
{code}
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