Creating a class Square which has a constructor and a methiod to calculate the area of the square.
class Square
def initialize(side)
@side = side
end
def printArea
@area = @side * @side
puts "Area is: #{@area}"
end
end
Creating 2 objects and adding them to an array
array = []
array << Square.new(4)
array << Square.new(10)
for i in array do
array[i].printArea
end
How do i acces the objects inside the array? I get an error: no implicit conversion of Square into Integer.
The for construct is hardly ever used in Ruby code. Instead you'd write:
array.each do |square|
square.printArea
end
This iterates over the array and returns each square object, which is what your code does as well. i is not an index, it's an element in the array.
As a note, Ruby strongly encourages method names and variables to be of the form print_area.
A more Ruby form of this code looks like this:
class Square
attr_accessor :side
def initialize(side)
@side = side.to_i
end
def area
@side * @side
end
end
squares = [ ]
squares << Square.new(10)
squares << Square.new(20)
squares.each do |square|
puts 'Square of side %d has area %d' % [ square.side, square.area ]
end
This consolidates your display logic outside of the model where you should be focused on other things.
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