Regarding Arrays

Ruby
1

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.

2

2010/5/26 Sourav H. [email protected]:

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

Cheers

robert

3

Robert K. wrote:

2010/5/26 Sourav H. [email protected]:

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

Cheers

robert
Thanx robert

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

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
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}”}

4

2010/5/27 Sourav H. [email protected]:

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

:slight_smile:

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.

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

5

Thanx Robert

One more Question !

How we implement DoublyLinkedList i.e append(node)
,search(node),delete(node) in Ruby ?

6

Sourav H. wrote:

Thanx Robert

One more Question !

How we implement DoublyLinkedList i.e append(node)
,search(node),delete(node) in Ruby ?

And can you tell me that how to build a good concept on Ruby.