Return Values in Sinatra

Return Values

The return value of a route block defines at least the response body sent to the HTTP client or at least the next middleware in the Rack stack. This is often a string. However, other values are also acceptable.

Any object that would either be a valid Rack response, a valid Rack body object, or an HTTP status code may be returned:

• An Array with three elements: [status (Integer), headers (Hash), response body (responds to #each)].
• An Array with two elements: [status (Integer), response body (responds to #each)].
• A Integer representing the status code.
• An object that responds to #each and passes nothing but strings to the given block.

In this way, a streaming example, for instance, may be quickly implemented:

class Stream
  def each
    100.times { |i| yield "#{i}\n" }
  end
end
get('/') { Stream.new }

You can also try this code with Online Ruby Compiler

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Frequently Asked Questions

What is a Domain Specific Language(DSL)?

A domain-specific language (DSL) is a computer language specialized for a particular application domain.

What is Sinatra?

Sinatra is an open-source framework developed in Ruby. It is a Domain Specific Language (DSL) for quickly creating web applications in Ruby with minimal effort.

What are web frameworks other than Sinatra?

Some popular web frameworks besides Sinatra are Ruby on Rails, Django, Flask, Express, Spring, etc.

What is Rack?

Rack is a webserver interface that allows Ruby frameworks to deal with HTTP or Web communications systematically. It enables you to manage any HTTP request and the pipeline of actions you may need to address, such as authentication, caching, and more, to provide a fantastic web-based software experience.

What is an API in Sinatra?

API stands for Application Programming Interface. It is a software intermediary that allows two applications to talk to each other.

Conclusion

In this article, we have extensively discussed the Sinatra framework and return values in Sinatra. I hope you enjoyed reading this article on Return Values in Sinatra. If you want to learn more, check out our articles on What Is Web2Py?, Why To Use Web2py?, Postbacks and Internationalization in web2py, Third Party Modules In Web2py, Tasks In Web2py, and  XML in Web2py.

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