You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: env.rb
    path of file: ./repos/artichoke/artichoke-backend/src/extn/core/env
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

ENV = Object.new

class << ENV
  def [](name)
    @backend ||= ::Ar
    
  def delete_if
    return to_enum(:delete_if) unless block_given?

    to_h.each do |key, value|
      delete(key) if yield key, value
    end
    to_h
  end