Thank you Rob, I appreciate your help, good explanation.
On Thu, Apr 26, 2018 at 5:02 PM, Rob Biedenharn <rob.biedenh...@gmail.com>
wrote:
>
>
> On 2018-Apr-26, at 13:47 , Abdel Latif <mlotfi2...@gmail.com> wrote:
>
> But [["AB_1020", "AB_950", "AB_50"], ["1000", "570"]] has non numerical
> values too.
>
> On Thursday, April 26, 2018 at 1:05:53 PM UTC-4, Walter Lee Davis wrote:
>>
>>
>> > On Apr 26, 2018, at 12:12 PM, Abdel Latif <mlotf...@gmail.com> wrote:
>> >
>> > Hi,
>> >
>> > I found this code for sorting an array :
>> >
>> > p ["AB_1020", "AB_950", "AB_50", "1000", "570"].partition{|x|
>> x.to_i.zero? }
>> > .flat_map{|x| x.sort_by {|x|x[/d+/]}.reverse}
>>
>
> You're missing that String#[] when given a Regexp returns the substring
> that matches that Regexp.
>
> [1] pry(main)> ["AB_1020", "AB_950", "AB_50",].map {|x| x[/\d+/]}
> => ["1020", "950", "50"]
> [2] pry(main)> ["AB_1020", "AB_950", "AB_50",].map {|x| x[/\d+/]}.sort
> => ["1020", "50", "950"]
> [3] pry(main)> ["AB_1020", "AB_950", "AB_50",].map {|x| x[/\d+/
> ]}.sort.reverse
> => ["950", "50", "1020"]
> [4] pry(main)> ["AB_1020", "AB_950", "AB_50",].map {|x| x[/\d+/
> ].to_i}.sort.reverse
> => [1020, 950, 50]
> [5] pry(main)> ["AB_1020", "AB_950", "AB_50",].sort_by {|x| x[/\d+/].to_i}
> => ["AB_50", "AB_950", "AB_1020"]
>
> -Rob
>
> > ouptut
>> >
>> > #⇒ ["AB_50", "AB_950", "AB_1020", "570", "1000"]
>> >
>> >
>> > I know that .partition{|x| x.to_i.zero? } will create an array of
>> arrays :
>> > [["AB_1020", "AB_950", "AB_50"], ["1000", "570"]]
>> >
>> >
>> > But this part .flat_map{|x| x.sort_by {|x|x[/d+/]}.reverse}
>>
>> flat_map: https://apidock.com/ruby/Enumerable/flat_map
>>
>> Then that passes a block, which acts on each member of the Enumerable
>> that called flat_map. That block sorts by the numerical value of x, then
>> reverses.
>>
>> Does that help?
>>
>> Walter
>>
>> >
>> > I could understand it.
>> >
>> > Thanks.
>> >
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