Getting Rid of the BANG (!) notation

currently we say

state.foo! 12
state.a_hash![:key] = 12
state.an_array! << 12

Wouldn't it be nice if we could just say:

state.foo = 12
state.a_hash[:key] = 12
state.an_array << 12

Hey its possible, with a slight catch!

We would have to do something like this:

Add a method mutator to the Object base class.

mutator would take one of two forms:

class CountedSet
  # CountedSet works like a set but if keeps track of how many times the item as been added to the set

  def set
    @set ||= Hash.new { |h, k| h[k] = 0 }
  end
  
  # use mutator to define methods that mutate the object's instance data
  mutator :<< do |item|
    set[item] += 1
  end
  def to_a
    set.keys
  end
  ... etc
end

  # for preexisting classes you can just give mutator a list of the method names that are mutators
  Hash.mutator :[], :delete, ... etc ... list all the methods that mutate the underlying state.

So the catch is we have to send mutator to all the base classes that have mutable operations. However once it's done it's done

POW!!!!