ruby_questions.rb

Q1.

# "def color" is a regular method and it will create a new instance method, when used without an explicit receiver.
# In the context of a class, self refers to the current class. Defining a method on self.shape creates a class method.
# def bar.radius creates singleton method attached to the object bar. 
# The difference between class methods and singleton methods is that class methods are available to all instances of
#  a class object while singleton methods are available only to that single instance.
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Q2.
  module Enumerable
    def each_third(n)
        (n - 1).step(self.size - 1, n).map { |i| "The circle is #{self[i]}" }
    end
end
puts ['white','yellow', 'blue', 'red', 'green', 'black', 'brown', 'azure'].each_third(3) 
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Q3.
SELECT * FROM employee
JOIN cars ON
employee.card_id = cars.id
AND employee.card_id IS NOT NULL
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Q4.
  def logic_q(value)
    case value
    when 1
        puts "your return value is 0 "
    when 0
        puts "your return value is 1 "
    else
        puts "Number must be 0 or 1"    
    end
end
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Q5.
  def color_picker (num)
    m3 = num.modulo(3) == 0
    m5 = num.modulo(5) == 0
    puts case
        when (m3 and m5) then 'blackwhite'
        when m3 then 'white'
        when m5 then 'black'
        else num
    end
end
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Q6.
   amount = base * percentage
summary = 2 * basis(amount) + extra(amount) * 1.05
   
if (province == 'BC')
    percentage = BC_PERCENTAGE
elsif (province == 'MB')
    percentage = MB_PERCENTAGE
    points = 2
elsif (province == 'NB')
    percentage = NB_PERCENTAGE
else
    percentage = 1
    amount = base   
end
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