Ruby on Rails

On 2018-Apr-26, at 13:47 , Abdel Latif <mlotfi2005@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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