groovy

Add a collate method to List

Details

  • Type: Improvement Improvement
  • Status: Closed Closed
  • Priority: Major Major
  • Resolution: Fixed
  • Affects Version/s: 1.8.5
  • Fix Version/s: 1.8.6, 2.0-beta-3
  • Component/s: None
  • Labels:
    None
  • Number of attachments :
    0

Description

I have often found a need for collating or partitioning a List into a List of sub-lists of a given size.

This question has been asked on StackOverflow a couple of times as well

ie:

[1,2,3,4,5].collate( 3 ) == [ [ 1, 2, 3 ], [ 4, 5 ] ]

This could be chained to generate a multi-dimensional list of lists, ie:

(1..9).collate( 3 ).collate( 2 ) == [ [ [1,2,3], [4,5,6] ],
                                      [ [7,8,9]          ] ]

Activity

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Tim Yates added a comment -

And this generated my first pull request of (hopefully) many:

https://github.com/groovy/groovy-core/pull/22

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Tim Yates added a comment - And this generated my first pull request of (hopefully) many: https://github.com/groovy/groovy-core/pull/22
Guillaume Laforge made changes -
Field Original Value New Value
Assignee Guillaume Laforge [ guillaume ]
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Guillaume Laforge added a comment -

Thank you Tim!

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Guillaume Laforge added a comment - Thank you Tim!
Guillaume Laforge made changes -
Status Open [ 1 ] Resolved [ 5 ]
Fix Version/s 2.0-beta-3 [ 18244 ]
Fix Version/s 1.8.6 [ 18245 ]
Resolution Fixed [ 1 ]
Paul King made changes -
Status Resolved [ 5 ] Closed [ 6 ]

People

  • Assignee:
    Guillaume Laforge
    Reporter:
    Tim Yates
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Dates

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    Updated:
    Resolved: