lingtran/Intro_to_sinatra_check.md

## Intro_to_sinatra_check.md

      
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    Introduction to Sinatra

1. What is the purpose of the server file (routing)?

It is the gatekeeper of the application. It's the first response in the request/response chain. It takes information from a request, parses it and then executes to plan depending on the HTTP verb, which determines what the client gets back.
2. How do you pass variables into the views?

Either as instance variable or local variables within the verb block. If local variable, utilize :locals, paired with view erb file/variable.
Ex: Instance Variable
get '/' do
@number = 8
erb :index
end
Ex: Local variable
get '/' do
number = 8
erb(:index, :local => { :number => number, :count => 12 } )
end
3. How can we interpolate ruby into a view (html)?

<%= ruby_code%> in ERB file.
4. In what format does data come in from a view/form? What do we call it?

a hash called params
5. What are params?

values assigned to the 'names' in the form/input tag are the keys to the params.