refactored.rb

# Original
Dir.glob("./commands/*.rb").each do |command|
  $commands << command.split("/").last.split('.rb').first
end

# Refactored
Dir.glob("./commands/*.rb").each do |command|
  $commands << File.basename(command, '.*')
end

# Orignal
cache = {}
vars.each do |var|
  cache[var] = ENV[var]
end

# Refactored
cache = Hash[vars.map { |var| [ var, ENV[var] ] }]

# Original
email = {}
email['example_email_1'] = {}
email['example_email_1']['recipient'] = "postmaster@noname.com"

# Refactored
email = {
  'example_email_1' => {
    'recipient' => "postmaster@noname.com"
  }
}

# Original
content = ""
response.each { |part| content += part }

# Refactored
content = response.join # or response.compact.join