How to do string sort by number in specified lines?

ruby-talk
2

I can't really read this blob, so I'm not sure at to it's point.

You want to "sort by" a subset of the string, numerically, and you already found "sort_by" (which basically IS the schwartzian transform in one beautiful method). So why not do just that?

    array.lines.sort_by { |s| s.split(",").last.scan(/\d+/).map(&:to_i) }

get the lines, sort them by: the last string segment in a comma separated string, look for digits, and convert them to integers.

I haven't tested it, and there are probably more elegant ways to do this, but it should get you moving in the right direction.

···

On Jan 24, 2014, at 2:23, Previn Lin <lists@ruby-forum.com> wrote:

array_tmp = string_sample.split("\n")
puts array_tmp.sort {|x| x.split(/,/)[1].split(/\/|\s+|:/)[3]}.sort_by
{|x| x.split(/,/)[1].split(/\/|\s+|:/)[4]}.sort_by {|x|
x.split(/,/)[1].split(/\/|\s+|:/)[5]}.sort_by {|x|
x.split(/,/)[1].split(/\/|\s+|:/)[6]}

3

Ryan Davis wrote in post #1134243:

You want to "sort by" a subset of the string, numerically, and you
already found "sort_by" (which basically IS the schwartzian transform in
one beautiful method). So why not do just that?

    array.lines.sort_by { |s| s.split(",").last.scan(/\d+/).map(&:to_i)
}

get the lines, sort them by: the last string segment in a comma
separated string, look for digits, and convert them to integers.

I haven't tested it, and there are probably more elegant ways to do
this, but it should get you moving in the right direction.

Dear Ryan,

Your solution works fine, I understand now, my method is sort one by
one, at last only last sort take effect.

Many thanks for your guide.

···

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4

I opt for using proper types:

irb(main):035:0> require 'time'
=> true
irb(main):036:0> puts str.each_line.sort_by {|line|
DateTime.parse(line[/start\s+(.*)/, 1])}
    name4 d58g7m NoXDisplay (v2012.12) (server4/port4 10195), start
Wed 1/22 10:30
    name6 bl460cc NoXDisplay (v2012.12) (server6/port6 16114), start
Thu 1/23 15:31
    name3 shandong NoXDisplay J3_ffffffffa8c0a600_21848_1 (v2012.12)
(server3/port3 8569), start Fri 1/24 9:26
    name2 shandong NoXDisplay J3_ffffffffa8c0a600_21848_2 (v2012.12)
(server2/port2 13335), start Fri 1/24 9:29
    name5 shandong NoXDisplay J3_ffffffffa8c0a600_21848_3 (v2012.12)
(server5/port5 6975), start Fri 1/24 9:30
    name1 bl460ca NoXDisplay (v2012.12) (server1/port1 18709), start
Fri 1/24 17:26
=> nil

Cheers

robert

···

On Fri, Jan 24, 2014 at 3:24 PM, Previn Lin <lists@ruby-forum.com> wrote:

Ryan Davis wrote in post #1134243:

You want to "sort by" a subset of the string, numerically, and you
already found "sort_by" (which basically IS the schwartzian transform in
one beautiful method). So why not do just that?

    array.lines.sort_by { |s| s.split(",").last.scan(/\d+/).map(&:to_i)
}

get the lines, sort them by: the last string segment in a comma
separated string, look for digits, and convert them to integers.

I haven't tested it, and there are probably more elegant ways to do
this, but it should get you moving in the right direction.

Your solution works fine, I understand now, my method is sort one by
one, at last only last sort take effect.

--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

5

Robert Klemme wrote in post #1134270:

I opt for using proper types:

irb(main):035:0> require 'time'
=> true
irb(main):036:0> puts str.each_line.sort_by {|line|
DateTime.parse(line[/start\s+(.*)/, 1])}
......
Cheers

robert

Wow, really good solution, thank you so much.

May I ask whether there is any forum thread or document I can reference
and study about the array usage " line[/start\s+(.*)/, 1]) " you used
here?

Thanks again.

···

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6

Previn Lin wrote in post #1134339:

May I ask whether there is any forum thread or document I can reference
and study about the usage and grammar of " line[/start\s+(.*)/,
1]) " you used here? How to do if want grab 2 or 3 brackets?

This is one of the (many) uses of String#

Notably: str[regexp, capture] → new_str or nil

If a Regexp is supplied, the matching portion of the string is returned.
If a capture follows the regular expression, which may be a capture
group index or name, follows the regular expression that component of
the MatchData is returned instead.

···

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7

Matthew Kerwin wrote in post #1134343:

Previn Lin wrote in post #1134339:

May I ask whether there is any forum thread or document I can reference
and study about the usage and grammar of " line[/start\s+(.*)/,
1]) " you used here? How to do if want grab 2 or 3 brackets?

This is one of the (many) uses of String#

Class: String (Ruby 2.1.0)

Notably: str[regexp, capture] → new_str or nil

If a Regexp is supplied, the matching portion of the string is returned.
If a capture follows the regular expression, which may be a capture
group index or name, follows the regular expression that component of
the MatchData is returned instead.

Dear Mattel,

I understand now, many thanks for your guide.

···

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