groovy

Add grep to Iterator, to return a new filtered Iterator

Details

  • Type: Improvement Improvement
  • Status: Closed Closed
  • Priority: Major Major
  • Resolution: Won't Fix
  • Affects Version/s: None
  • Fix Version/s: None
  • Component/s: None
  • Labels:
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  • Number of attachments :
    0

Description

grep currently works on collections, but it would be nice to have it work on Iterators

We could then do lazy things like:

// Set our initial value
def a = 1
// Define an iterator around this value
def iter = [ hasNext:{ true }, next:{ a++ } ] as Iterator

// Define a new iterator that will just emit odd numbers
def oddIter = iter.grep { it % 2 }

// Check it's working
assert [ 1, 3, 5 ] == oddIter.take( 3 ).collect()

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Tim Yates added a comment -

https://github.com/groovy/groovy-core/pull/40

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Tim Yates added a comment - https://github.com/groovy/groovy-core/pull/40
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blackdrag blackdrag added a comment -

tim, thanks for the request, but I think such an lazy collection approach is better put into your http://timyates.github.com/groovy-stream/

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blackdrag blackdrag added a comment - tim, thanks for the request, but I think such an lazy collection approach is better put into your http://timyates.github.com/groovy-stream/

People

  • Assignee:
    blackdrag blackdrag
    Reporter:
    Tim Yates
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    Updated:
    Resolved: