What are some examples of lexical scope in Ruby?

What are some examples of lexical scope in Ruby?

Lexical scope in Ruby refers to the visibility of variables within different parts of the code. For example, variables defined inside a method are not accessible outside of it.

Can you give me a specific code example?

Sure! Here's a simple example:

def outer_method
  outer_var = 'I am outside'

  inner_method = lambda do
    puts outer_var
  end

  inner_method.call
end

outer_method

In this case, outer_var is accessible inside the inner_method due to lexical scoping.

What happens if I try to access outer_var outside of outer_method?

If you try to access outer_var outside of outer_method, you'll get an error because outer_var is not defined in that scope.

Are there any exceptions to this rule?

In Ruby, closures like lambdas and procs can capture variables from their surrounding scope, but once you exit that scope, those variables are no longer accessible.