mykiy

class Work 
  def name=(name) #which works like a setter method of class
    @name = name
  end 
  def name #which works like a gettter method, gets the name from current object scope
    @name
  end 
 end 
 
 job = Work.new #which creates the new instance object

mykiy

class Work 
  def initialize(name) #when instance object created, the object calls the inititalize method and initiated the valur to instance variables
    @name = name
  end 
  def duration=(time)
    @duration = time
  end 
  def duration
    @duration
  end 

mykiy

class Work
  attr_accessor :name, :duration
  def intialize(name, duration)
    @name, @duration = name, duration
  end
 end
 job = Work.new("ROR learning", "1month")
 job.name
 => "ROR learning"
 job.duration

mykiy

class Work 
  attr_accessor :name, :duration
end
job = Work.new("ROR learning", "1month")
job.name
=> "ROR learning"
job.name = "Ruby learning"
job.name
=> "Ruby learning"

mykiy

class Work
  def initialize(name)
    @name = name
  end
  def name
    @name
  end
  def name=(name)
    @name = name
  end

mykiy

p = Proc.new do #proc is a object, actually a block of code stored in a instance variable 
  "hello"
end
p.call

-----

p = Proc.new do |num|
  num * num
end

mykiy

l = -> (name) { puts "#{name}" }
l.call("velu")
=> 
velu
--------

l = -> (num) { num * 5 } # l  is the variable which stores the block of code, when we calls the l the block of code will be executed.
l.call(5) #Another important thing is lambda is an object.
=> 
25

mykiy

#reduce
def sum(*args) #sum method accepts many number of arguments that method passed
  args.reduce(0, :+) #reduce will reduce the array in single number, 0 is the initial value and + tells the reduce method to perform addition
end
sum(1,2,3,4)
=>
10
-----
multiplication

mykiy

arr = [1,2,3,4,5]
arr.each { |n| n + 2 }
arr 
=> [1,2,3,4,5]
arr.map! { |n| n + 2 }
arr
=> 
[3,4,5,6,7]
arr.collect! { |n| n + 2 }
arr

mykiy

movies = {
 Ravanan: 4.8,
 Thanioruvan: 4.5,
 payanangal: 4
}

puts "What would you like to do?"
puts "-- Type 'add' to add a movie."
puts "-- Type 'update' to update a movie."
puts "-- Type 'display' to display all movies."