diff --git a/Gemfile b/Gemfile
index 926c627..26acfc9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 
 gemspec
diff --git a/Rakefile b/Rakefile
index efbd5a9..3d5a4dd 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rubygems'
 require 'bundler/setup'
 require 'rspec/core/rake_task'
diff --git a/bin/floaty b/bin/floaty
index 6fe5b10..1a1b0be 100755
--- a/bin/floaty
+++ b/bin/floaty
@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 $LOAD_PATH.unshift(File.expand_path('../../lib', __FILE__))
 
diff --git a/lib/vmfloaty.rb b/lib/vmfloaty.rb
index 390d2ab..4a29e49 100644
--- a/lib/vmfloaty.rb
+++ b/lib/vmfloaty.rb
@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 require 'rubygems'
 require 'commander'
diff --git a/lib/vmfloaty/auth.rb b/lib/vmfloaty/auth.rb
index 7d33327..bbe7425 100644
--- a/lib/vmfloaty/auth.rb
+++ b/lib/vmfloaty/auth.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'faraday'
 require 'json'
 require 'vmfloaty/http'
diff --git a/lib/vmfloaty/conf.rb b/lib/vmfloaty/conf.rb
index 2f04e61..a232f8d 100644
--- a/lib/vmfloaty/conf.rb
+++ b/lib/vmfloaty/conf.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'yaml'
 
 class Conf
diff --git a/lib/vmfloaty/errors.rb b/lib/vmfloaty/errors.rb
index ee8e2cb..098a94c 100644
--- a/lib/vmfloaty/errors.rb
+++ b/lib/vmfloaty/errors.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AuthError < StandardError
   def initialize(msg='Could not authenticate to pooler')
     super
diff --git a/lib/vmfloaty/http.rb b/lib/vmfloaty/http.rb
index f21b993..71f955d 100644
--- a/lib/vmfloaty/http.rb
+++ b/lib/vmfloaty/http.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'faraday'
 require 'uri'
 
diff --git a/lib/vmfloaty/nonstandard_pooler.rb b/lib/vmfloaty/nonstandard_pooler.rb
index 7384db8..512e90d 100644
--- a/lib/vmfloaty/nonstandard_pooler.rb
+++ b/lib/vmfloaty/nonstandard_pooler.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'vmfloaty/errors'
 require 'vmfloaty/http'
 require 'faraday'
@@ -24,15 +26,7 @@ class NonstandardPooler
     conn = Http.get_conn(verbose, url)
     conn.headers['X-AUTH-TOKEN'] = token if token
 
-    os_string = ''
-    os_type.each do |os, num|
-      num.times do |_i|
-        os_string << os + '+'
-      end
-    end
-
-    os_string = os_string.chomp('+')
-
+    os_string = os_type.map { |os, num| Array(os) * num }.flatten.join('+')
     if os_string.empty?
       raise MissingParamError, 'No operating systems provided to obtain.'
     end
diff --git a/lib/vmfloaty/pooler.rb b/lib/vmfloaty/pooler.rb
index 539e85b..a84035b 100644
--- a/lib/vmfloaty/pooler.rb
+++ b/lib/vmfloaty/pooler.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'faraday'
 require 'vmfloaty/http'
 require 'json'
@@ -37,15 +39,7 @@ class Pooler
       conn.headers['X-AUTH-TOKEN'] = token
     end
 
-    os_string = ''
-    os_type.each do |os,num|
-      num.times do |i|
-        os_string << os+'+'
-      end
-    end
-
-    os_string = os_string.chomp('+')
-
+    os_string = os_type.map { |os, num| Array(os) * num }.flatten.join('+')
     if os_string.empty?
       raise MissingParamError, 'No operating systems provided to obtain.'
     end
diff --git a/lib/vmfloaty/service.rb b/lib/vmfloaty/service.rb
index aa0dae0..e1ce49e 100644
--- a/lib/vmfloaty/service.rb
+++ b/lib/vmfloaty/service.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'commander/user_interaction'
 require 'commander/command'
 require 'vmfloaty/utils'
diff --git a/lib/vmfloaty/ssh.rb b/lib/vmfloaty/ssh.rb
index 4087d3a..6afc03e 100644
--- a/lib/vmfloaty/ssh.rb
+++ b/lib/vmfloaty/ssh.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Ssh
 
   def self.which(cmd)
diff --git a/lib/vmfloaty/utils.rb b/lib/vmfloaty/utils.rb
index fca7a32..763bb8f 100644
--- a/lib/vmfloaty/utils.rb
+++ b/lib/vmfloaty/utils.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'vmfloaty/pooler'
 require 'vmfloaty/nonstandard_pooler'
 
diff --git a/lib/vmfloaty/version.rb b/lib/vmfloaty/version.rb
index 4000441..1521a18 100644
--- a/lib/vmfloaty/version.rb
+++ b/lib/vmfloaty/version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Vmfloaty
   VERSION = '0.8.2'.freeze
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 982b1ed..558a0ad 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'vmfloaty'
 require 'webmock/rspec'
 
diff --git a/spec/vmfloaty/auth_spec.rb b/spec/vmfloaty/auth_spec.rb
index 8a527ed..0869a33 100644
--- a/spec/vmfloaty/auth_spec.rb
+++ b/spec/vmfloaty/auth_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 require_relative '../../lib/vmfloaty/auth'
 
diff --git a/spec/vmfloaty/nonstandard_pooler_spec.rb b/spec/vmfloaty/nonstandard_pooler_spec.rb
index 7b03827..332e491 100644
--- a/spec/vmfloaty/nonstandard_pooler_spec.rb
+++ b/spec/vmfloaty/nonstandard_pooler_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 require 'vmfloaty/utils'
 require 'vmfloaty/errors'
diff --git a/spec/vmfloaty/pooler_spec.rb b/spec/vmfloaty/pooler_spec.rb
index 397e99a..43524d4 100644
--- a/spec/vmfloaty/pooler_spec.rb
+++ b/spec/vmfloaty/pooler_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 require_relative '../../lib/vmfloaty/pooler'
 
diff --git a/spec/vmfloaty/service_spec.rb b/spec/vmfloaty/service_spec.rb
index 78ba671..3f709ce 100644
--- a/spec/vmfloaty/service_spec.rb
+++ b/spec/vmfloaty/service_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative '../../lib/vmfloaty/service'
 
 describe Service do
diff --git a/spec/vmfloaty/utils_spec.rb b/spec/vmfloaty/utils_spec.rb
index 1885bfa..2ec858b 100644
--- a/spec/vmfloaty/utils_spec.rb
+++ b/spec/vmfloaty/utils_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 require 'json'
 require 'commander/command'
diff --git a/vmfloaty.gemspec b/vmfloaty.gemspec
index 4317b4a..fcbaaab 100644
--- a/vmfloaty.gemspec
+++ b/vmfloaty.gemspec
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 $LOAD_PATH.push File.expand_path('../lib', __FILE__)
 require 'vmfloaty/version'