시나트라 2

• Partial 

<%= erb "_navigation".to_sym %> 

• <%= : evaluate and put out the result into stringn. 

• <% : just 
• evaluate them.
• file directory only take symbol.
• [q] We just come into our template, you call erb, and as long as you pass in a symbol, that locates the file, then it'll render it for you. 
• reusable piece ( like function ) 
•