Why should @@class_variables be avoided in Ruby?

user_427494 0
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I know that some say that class variables (e.g. @@class_var) should be avoid in Ruby and should use the an instance variable (e.g. @instance_var) in the class scope instead:

def MyClass
  @@foo = 'bar' # Should not do this.
  @foo = 'bar'  # Should do this.
end

Why is the use of class variables frowned upon in Ruby?

class-instance-variables class-variables ruby
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