From: Robert Klemme <shortcutter@...>
Date: 2010-05-27T18:47:47+09:00
Subject: Re: Regarding Arrays

2010/5/27 Sourav Haldar <sourav.haldar2010@hotmail.com>:
> Robert Klemme wrote:
>> 2010/5/26 Sourav Haldar <sourav.haldar2010@hotmail.com>:
>>>
>>> I am trying to build a Class 'Employee' in which age,address,idno
>>> methods should be there . So i need to built a Array in which the
>>> elements are called by idno and get sorted.
>>
>> Not sure what you're after, probably something like this
>>
>> Employee = Struct.new :idno, ...
>>
>> employees = [ ... ]
>> sorted = employees.sort_by {|e| e.idno}
>> sorted = employees.sort_by(&:idno) # alternative

> I have built a program but wants to make it more short . SO plz see
> wether is it possible or not

It is.

Employee = Struct.new :name, :age, :address, :idno

a = [
  Employee["Cindy", 24, "Mumbay", 121],
  Employee["Kennedy", 29, "ruby-talk", 131],
]

a.sort_by(&:idno).each do |x|
  puts x.map(&:to_s).join(" ")
end

:-)

> class  Employee
>  attr_accessor :name ,:age, :address, :idno
> end
>
>   a = Array.new
>   e1 = Employee.new
>   e1.name = "Cindy"
>   e1.age = 24
>   e1.address = "Mumbai"
>   e1.idno = 121
>   a.push(e1) # insert the values of e1 in the array a
>   puts '------------------------'
>   e2 = Employee.new

You do not need a new local variable here: you can reuse "e1" since
the object created above is in the Array already.

>   e2.name = "Kennedy"
>   e2.age = 29
>   e2.address = "Kolkata"
>   e2.idno = 131
>   a.push(e2)  # insert the values of e2 in the array a
>   puts '------------------------'
>   e3 = Employee.new
>   e3.name = "Pearl"
>   e3.age = 35
>   e3.address = "Chennai"
>   e3.idno = 141
>   a.push(e3)  # insert the values of e3 in the array a
>
>   a.sort!{|x,y|
>   x.idno <=> y.idno
>
>   }
>
>   a.collect!{|x|puts "#{x.name}  #{x.age} #{x.address} #{x.idno}"}

You should use #each here instead of #collect! because I believe you
only want to output all elements in the Array but not change the Array
itself.

Kind regards

robert


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