title: Ruby - TypeError: no implicit conversion of Hash into String
body: <p>Trying to parse some JSON, byt why is <code>text</code> empty?</p>
  
  <p><strong>Desired output:</strong></p>
  
  <p><code>text</code> should return <code>Hello world\n\nApple, Harbor\n\nBanana, Kitchen\n\nMango, Bedroom</code></p>
  
  <pre><code>text = "Hello world"
  
  json = '{"fruits": [{"name": "Apple", "location": "Harbor"}, {"name": "Banana", "location": "Kitchen"}, {"name": "Mango", "location": "Bedroom"}]}'
  fruits = JSON.parse(json)
  
  def format_fruits(fruits)
    fruits.each do |fruit|
      puts "\n\n#{ fruit[0]['name'] }, #{ fruit[0]['location'] }"
    end.to_sentence
  end
  
  text += format_fruits(fruits)
  text
  </code></pre>
  
  <p><strong>Current output:</strong></p>
  
  <pre><code>TypeError: no implicit conversion of Hash into String
          from (irb):5:in `+'
          from (irb):5
          from /home/mark/.gem/ruby/2.1.1/gems/railties-4.1.7/lib/rails/commands/console.rb:90:in `start'
          from /home/mark/.gem/ruby/2.1.1/gems/railties-4.1.7/lib/rails/commands/console.rb:9:in `start'
          from /home/mark/.gem/ruby/2.1.1/gems/railties-4.1.7/lib/rails/commands/commands_tasks.rb:69:in `console'
          from /home/mark/.gem/ruby/2.1.1/gems/railties-4.1.7/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
          from /home/mark/.gem/ruby/2.1.1/gems/railties-4.1.7/lib/rails/commands.rb:17:in `&lt;top (required)&gt;'
          from /home/mark/.gem/ruby/2.1.1/gems/activesupport-4.1.7/lib/active_support/dependencies.rb:247:in `require'
          from /home/mark/.gem/ruby/2.1.1/gems/activesupport-4.1.7/lib/active_support/dependencies.rb:247:in `block in require'
          from /home/mark/.gem/ruby/2.1.1/gems/activesupport-4.1.7/lib/active_support/dependencies.rb:232:in `load_dependency'
          from /home/mark/.gem/ruby/2.1.1/gems/activesupport-4.1.7/lib/active_support/dependencies.rb:247:in `require'
          from /home/mark/myapp/bin/rails:8:in `&lt;top (required)&gt;'
          from /home/mark/.gem/ruby/2.1.1/gems/activesupport-4.1.7/lib/active_support/dependencies.rb:241:in `load'
          from /home/mark/.gem/ruby/2.1.1/gems/activesupport-4.1.7/lib/active_support/dependencies.rb:241:in `block in load'
          from /home/mark/.gem/ruby/2.1.1/gems/activesupport-4.1.7/lib/active_support/dependencies.rb:232:in `load_dependency'
          from /home/mark/.gem/ruby/2.1.1/gems/activesupport-4.1.7/lib/active_support/dependencies.rb:241:in `load'
          from /home/mark/.gem/ruby/2.1.1/gems/spring-1.1.3/lib/spring/commands/rails.rb:6:in `call'
          from /home/mark/.gem/ruby/2.1.1/gems/spring-1.1.3/lib/spring/command_wrapper.rb:38:in `call'
          from /home/mark/.gem/ruby/2.1.1/gems/spring-1.1.3/lib/spring/application.rb:180:in `block in serve'
          from /home/mark/.gem/ruby/2.1.1/gems/spring-1.1.3/lib/spring/application.rb:153:in `fork'
          from /home/mark/.gem/ruby/2.1.1/gems/spring-1.1.3/lib/spring/application.rb:153:in `serve'
          from /home/mark/.gem/ruby/2.1.1/gems/spring-1.1.3/lib/spring/application.rb:128:in `block in run'
          from /home/mark/.gem/ruby/2.1.1/gems/spring-1.1.3/lib/spring/application.rb:122:in `loop'
          from /home/mark/.gem/ruby/2.1.1/gems/spring-1.1.3/lib/spring/application.rb:122:in `run'
          from /home/mark/.gem/ruby/2.1.1/gems/spring-1.1.3/lib/spring/application/boot.rb:18:in `&lt;top (required)&gt;'
          from /home/mark/.rubies/ruby-2.1.1/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
          from /home/mark/.rubies/ruby-2.1.1/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
          from -e:1:in `&lt;main&gt;'irb(main):006:0&gt; text
  =&gt; "Hello world"
  irb(main):007:0&gt;
  </code></pre>