How to initialize an array of object in Ruby

Question

can anyone tell me how to initialize an array of object in Ruby. I have my class Line:

class Line
  @@text
  @@number = 0
  @@file = 0
  @@paired

  def initialize(text, number, file = 0, paired = 1)
    @@text = text
    @@number = number
    @@file = file
    @@paired = paired
  end
end

And now i wish to initialize an Array of Lines, when i do parsedLines = Array.new() and in loop do parsedLines[i] = Line.new(line, number, file, 0) i got an array of Lines, but Array elements are initialize on last made Line object, how can i fix this, to have array of Line object?

user229044 · Accepted Answer · 2014-03-13 13:13:00Z

2

That's what @@ does. It defines a class-level variable, shared by all instances of the class. Each time you declare a new instance, you're overwriting those values, so of course your entire array will appear to contain the same object.

Change @@ to @ in your initialize method, and remove the class-level @@ variables completely, they serve no purpose. You do not need to declare variables this way in Ruby.

The correct implementation would be:

class Line
  def initialize(text, number = 0, file = 0, paired = 1)
    @text = text
    @number = number
    @file = file
    @paired = paired
  end
end

answered Mar 13, 2014 at 13:13

user229044♦

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