scope.md

Scope of Names

For each of the following programs: what is the return value of the last expression? Why?

def a(a)
  a
end

a(1)

a = [1,2,3]
a.map { |x| a }

a = 1

def x
  a = 2
end

x
a  

a = [1,2,3]
a.map { |a| a }