Normal Variables Vs Instance variable in Ruby, Whats the difference?

Question

Consider the following sample ruby class

class User
  def hello
    puts \"hello\"
  end
end

now, for initialization. there are two ways

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Answer 1

A local variable can be used only within the method in which it is defined (or, when the variable is defined at the top level, only outside of any method). An instance variable can be used from any method that is called on the same instance.

Here's an example where you can see the difference:

@tr = User.new

def foo
  @tr.hello
end

foo
# Hello World


tr = User.new

def bar
  tr.hello
end

bar
# Exception because tr is not accessible from within bar