#key:Store value in a lump
fruits = {"a":"apple", "b":"grape", "c":"orange"} 
puts fruits
puts fruits[:a] #Extract by key value

#Execution result
{:a=>"apple", :b=>"grape", :c=>"orange"}
apple

if condition A
Processing when the conditions are met
elsif condition B
Processing when condition B is not matched and condition A is not matched
else
Condition A,Processing when neither of B matches
end

list = [1, 2, 3, 4, 5]
for item in list
    puts item
end

#Execution result
1
2
3
4
5

a = 1
while a <= 10 do
    puts a
    a += 1
end

#Execution result
1
2
3
4
5
6
7
8
9
10

begin
Code to execute
rescue
Code that runs only when an exception occurs
else
Code that runs only when no exception is raised
end

begin
Code to execute
rescue
Code that runs only when an exception occurs
else
Code that runs only when no exception is raised
ensure
Last code executed with or without exceptions
end

raise error type

#Method
def drinkServer(fruit)
    drink = fruit + 'juice'
    return drink
end

puts drinkServer('Apple')

#Output result
Apple juice

#Declare a class to handle circles
class Circle #Uppercase letters at the beginning of the class name
 
  def area_circle
    puts @radius * @radius * 3.14
  end
 
  #When functions etc. are continuous, insert one blank line between them.
  def circumference
    puts @radius * 2 * 3.14
  end
 
  def radius=(radius)
    @radius = radius
  end
end
 
#Create an instance
circle1 = Circle.new
 
#Enter the radius
circle1.radius = 3
 
#Call a function
circle1.area_circle
circle1.circumference

class class name<Class name you want to inherit
 
end

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