Array assign vs. append behavior
ruby
Solution
You redefine local variable in the first method.
This is the same as
visited = []
local_visited = visited
local_visited = ['A']
visited
# => []
And in the second method:
visited = []
local_visited = visited
local_visited << 'A'
visited
# => ["A"]
Problem
The following behavior looks to me like the `assign` method is processing `visited` by value, whereas the `append` method is treating it as a reference: ``` class MyClass def assign(visited) visited += ["A"] end def append(visited) visited << "A" end end instance = MyClass.new visited = [] instance.assign(visited) visited # => [] instance.append(visited) visited # => ["A"] ``` Can someone explain this behavior? This is not a question about whether Ruby supports pass by reference or pass by value, but rather about the example provided below, and why two methods that purportedly do the same thing exhibit different behaviors.