asakusa.rb

def give_ujihisa_money(users, value)
  # users[:ujihisa][:money] = 24
  update_in2(-> { users[:ujihisa][:money] }, 24)
  # put_in(users[:ujihisa][:money], 24)
  # dig <-> bury
end

def update_in2(f, value)
  pp RubyVM::InstructionSequence.of(f).to_a
  nil
end

def update_in(hash, keys, value)
  if keys.empty?
    value
  else
    key, *keys = *keys
    hash.merge(key => update_in(hash[key], keys, value))
  end
end

users = {ujihisa: {money: 23}.freeze, joker: {money: 0}.freeze}.freeze
users = give_ujihisa_money(users, 24)
p users

update_in { users[:ujihisa][:money] = 24 }

local_variable_setするときはthread safetyに注意