Marnen Laibow-Koser wrote:
> [...]
>> ## Column-wise is a bit more work
>>
>> irb> row_count = (array.length + (3-1))/3
>> => 5
>> irb> columns = []
>> => []
> [...]
>
> Why go to all that trouble? in_groups and zip. Done. No arithmetic.
>
> Best,
> --
> Marnen Laibow-Koser
> http://www.marnen.org
> [email protected]
That really depends on what the desired output is. The OP indicated that
he was looking for a phone book style sorting, top-to-bottom,
left-to-right.
> It currently sorts my categories as below:
>
> | Category1 Category2 Category3 | Category4 Category5 Category6 |
>
> This is not what I want. What I want is:
>
> | Category1 | Category4 |
> | Category2 | Category5 |
> | Category3 | Category6 |
in_groups doesn't do exactly that. Here is an example:
Given a = [1,2,3,4,5,6,7,8,9] and I want the output to be
1 6
2 7
3 8
4 9
5
>> a = [1,2,3,4,5,6,7,8,9]
=> [1, 2, 3, 4, 5, 6, 7, 8, 9]
>> a.in_groups(2)
=> [[1, 2, 3, 4, 5], [6, 7, 8, 9, nil]]
>> a.in_groups_of(2)
=> [[1, 2], [3, 4], [5, 6], [7, 8], [9, nil]]
Here is a method that was constructed back in the Rails 1.2 days [1]:
def in_vertical_groups_of(number, fill_with = nil, &block)
return in_groups_of((size.to_f / number).ceil, fill_with,
&block).transpose
end
>> a.in_vertical_groups_of(2)
=> [[1, 6], [2, 7], [3, 8], [4, 9], [5, nil]]
I add this to something that is in config/intializers
module ActiveSupport
module CoreExtensions
module Array
module Grouping
def in_vertical_groups_of
end
end
end
end
end
Peace,
Phillip
[1] original thread: http://www.ruby-forum.com/topic/137230
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