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senthil

2007-Mar-26 12:50 UTC

sorting an array based on two attributes of objects

Hi all,
     I want to sort the objects of array based on two attributes.I want
sort an employee class based on his salary and name , so that if two
person has same salary it should be sorted with name.
     Lets say for example the employee objects has following name and
salary.

         name      salary
           d        100
           c        200
           b        50
           a        100


     so in this case the result which i expect is

         name      salary
           c        50
           a        100
           d        100
           b        200

  Note:In the above example for salary 100 the sorting is done
alphabetically, but initially(before sorting) ''d'' came first
and then
''a'' came.so basically i want to sort the array with more than
one order.
  Can any one help me to solve it ??

-- 
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Michael Wang

2007-Mar-26 13:24 UTC

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Re: sorting an array based on two attributes of objects

senthil wrote:> Hi all,
>      I want to sort the objects of array based on two attributes.I want
> sort an employee class based on his salary and name , so that if two
> person has same salary it should be sorted with name.
>      Lets say for example the employee objects has following name and
> salary.
> 
>          name      salary
>            d        100
>            c        200
>            b        50
>            a        100
> 
> 
>      so in this case the result which i expect is
> 
>          name      salary
>            c        50
>            a        100
>            d        100
>            b        200
> 
>   Note:In the above example for salary 100 the sorting is done
> alphabetically, but initially(before sorting) ''d'' came
first and then
> ''a'' came.so basically i want to sort the array with more
than one order.
>   Can any one help me to solve it ??
> 
Use sort_by and have it return an array of the two objects you want sorted:

[26]irb
irb(main):001:0> myarray = [{:name => "d", :salary => 100},
{:name =>
"c", :salary => 200}, {:name => "a", :salary =>
100}]
=> [{:salary=>100, :name=>"d"}, {:salary=>200,
:name=>"c"},
{:salary=>100, :name=>"a"}]
irb(main):002:0> myarray.sort_by {|h| [h[:salary], h[:name]] }
=> [{:salary=>100, :name=>"a"}, {:salary=>100,
:name=>"d"},
{:salary=>200, :name=>"c"}]


-- 
Michael Wang

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Rob Biedenharn

2007-Mar-26 13:24 UTC

head link

Re: sorting an array based on two attributes of objects

On Mar 26, 2007, at 8:50 AM, senthil wrote:> Hi all,
>      I want to sort the objects of array based on two attributes.I  
> want
> sort an employee class based on his salary and name , so that if two
> person has same salary it should be sorted with name.
>      Lets say for example the employee objects has following name and
> salary.
>
>          name      salary
>            d        100
>            c        200
>            b        50
>            a        100
>
>
>      so in this case the result which i expect is
>
>          name      salary
>            c        50
>            a        100
>            d        100
>            b        200
>
>   Note:In the above example for salary 100 the sorting is done
> alphabetically, but initially(before sorting) ''d'' came
first and then
> ''a'' came.so basically i want to sort the array with more
than one
> order.
>   Can any one help me to solve it ??
[ [''d'',100], [''c'',200],
[''b'',50], [''a'',100] ].sort_by {|ns|
[ ns.last, ns.first ]}
=> [["b", 50], ["a", 100], ["d", 100],
["c", 200]]

An array compares on its elements.

-Rob

Rob Biedenharn		http://agileconsultingllc.com
Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org



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senthil

2007-Mar-26 13:57 UTC

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sorting an array based on two attributes of objects

Thanks for some of your replies for the lst post i need small
modification in that post .. i want to sort the salary in descending
order. i have explained the same quesion again....

Hi all,
     I want to sort the objects of array based on two attributes.I want
sort an employee class based on his salary in descecding order and name
, so that if two
person has same salary it should be sorted with name.
     Lets say for example the employee objects has following name and
salary.

         name      salary
           d        100
           c        200
           b        50
           a        100


     so in this case the result which i expect is

         name      salary
           b        200
           a        100
           d        100
           c        50

  Note:In the above example for salary 100 the sorting is done
alphabetically, but initially(before sorting) ''d'' came first
and then
''a'' came.so basically i want to sort the array with more than
one order.
  Can any one help me to solve it ??

-- 
Posted via http://www.ruby-forum.com/.

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Rob Biedenharn

2007-Mar-26 15:00 UTC

head link

Re: sorting an array based on two attributes of objects

On Mar 26, 2007, at 9:57 AM, senthil wrote:> Thanks for some of your replies for the lst post i need small
> modification in that post .. i want to sort the salary in descending
> order. i have explained the same quesion again....
>
> Hi all,
>      I want to sort the objects of array based on two attributes.I  
> want
> sort an employee class based on his salary in descecding order and  
> name
> , so that if two
> person has same salary it should be sorted with name.
>      Lets say for example the employee objects has following name and
> salary.
>
>          name      salary
>            d        100
>            c        200
>            b        50
>            a        100
>
>
>      so in this case the result which i expect is
>
>          name      salary
>            b        200
>            a        100
>            d        100
>            c        50
>
>   Note:In the above example for salary 100 the sorting is done
> alphabetically, but initially(before sorting) ''d'' came
first and then
> ''a'' came.so basically i want to sort the array with more
than one
> order.
>   Can any one help me to solve it ??
>
[ [''d'',100], [''c'',200],
[''b'',50], [''a'',100] ].sort_by {|ns|
[ - ns.last, ns.first ]}
=> [["b", 50], ["a", 100], ["d", 100],
["c", 200]]

An array compares on its elements.  (The only change from my earlier  
response is to negate the salary for sorting purposes.)

-Rob

Rob Biedenharn		http://agileconsultingllc.com
Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org



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Rails - Mar 2007 - sorting an array based on two attributes of objects

sorting an array based on two attributes of objects

Re: sorting an array based on two attributes of objects

Re: sorting an array based on two attributes of objects

sorting an array based on two attributes of objects

Re: sorting an array based on two attributes of objects