multiple require refactorings

require.rb

require 'nokogiri'
require 'active_support'
require 'benchmark'

# equal to...

list = ['nokogiri', 'active_support', 'benchmark']

## never use `for` cycle (unless you know exactly why), it's considered a bad practice, 
## you save one method call since `for` calls `each` method internally anyway
for x in list
  require x
end

# equal to...

['nokogiri', 'active_support', 'benchmark'].each do |x|
  require x
end

# equal to...

['nokogiri', 'active_support', 'benchmark'].each {|x| require x}

# equal to...

['nokogiri', 'active_support', 'benchmark'].each &method(:require)

# equal to...

%w(nokogiri active_support benchmark).each &method(:require)