Add "# frozen_string_literal: true" to the beggining of ruby files.

This is make string literals immutable which is increase speed and make
code a bit more thread safe. This feature has been introduced in Ruby
2.3.0.

Author: zekefast

Gemfile

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 # Specify your dependencies in com-common.gemspec

Rakefile

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "bundler/gem_tasks"
 require "rspec/core/rake_task"
 

bin/console

@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 require "bundler/setup"
 require "com"

com-common.gemspec

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 lib = File.expand_path("../lib", __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 

exe/com-common

@@ -1,3 +1,4 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 require "com"

lib/com-common.rb

@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require "com"

lib/com.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Namespace for Com set of libraries.
 #
 # Purpose: namespace

lib/com/abstract_method_error.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Represents errors related to "abstract" methods.
 #
 # Despite Ruby does not have

lib/com/common.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "com/common/version"
 
 

lib/com/common/error.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Purpose: mixin
 #
 # @see ::Com::Error

lib/com/common/version.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # GOTCHA: this file is an exclusion from rule or plain module definition, because
 #   it is used in com-common.gemspec file where all root namespaces
 #   do not loaded. So, they have to be defined hierarchically.

lib/com/error.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Purpose: mixin
 #
 # This module should be mixed into all exceptions of ::RuntimeError type.

lib/com/standard_error.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Purpose: mixin
 #
 # This module should be mixed into all exceptions of ::StandardError type.

spec/com-common_helper.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 $LOAD_PATH.unshift(File.expand_path("../../lib", __FILE__))
 
 

spec/lib/com/abstract_method_error_spec.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 ::RSpec.describe ::Com::AbstractMethodError do
   describe ".method_not_overridden_error" do
     let(:klass)       { SomeArbitraryClass }

spec/lib/com/common/error_spec.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 ::RSpec.describe ::Com::Common::Error do
   it { expect(described_class).to include(::Com::Error) }
 end

spec/lib/com/common_spec.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 ::RSpec.describe ::Com::Common do
   it "has a version number" do
     expect(::Com::Common::VERSION).not_to be nil

spec/lib/com/error_spec.rb

@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 ::RSpec.describe ::Com::Error do
 end

spec/lib/com/standard_error_spec.rb

@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 ::RSpec.describe ::Com::StandardError do
 end

spec/lib/com_spec.rb

@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 ::RSpec.describe ::Com do
 end

spec/spec_helper.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # This file was generated by the `rspec --init` command. Conventionally, all
 # specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
 # The generated `.rspec` file contains `--require spec_helper` which will cause