Cacher is the code snippet organizer for pro developers

Check if a page variable has been defined

1. Set variables in a page (page.html.haml) at the very biginning of the file:

   ---
   variable: value
   variable2: value 2
   ---
   

2. Logic either in a partial or in the page itself

   - if data.page.variable2 != nil
       / Do whatever here
   

Check if a local variable has been passed at the partial call

1. Pass variables in a partial call from a page:

   = partial(:"components/my_partial", :locals => { :variable => "value", :is_teaser => true, :limit => 4 })
   

2. Check the variables in the components/_my_partial.haml file

   - if defined? variable2
       / Do whatever here
   

3. Check the variable in a ternary operator. Setting nil as false param in a ternary operator causes the property (class in the example) to be removed

   %a.app_box{:href => "#", :class => (defined? extraclass) ? "#{extraclass}" : nil}
   

Check typeof a variable.
Possible types:

• Integer
• Numeric
• Fixnum
• Array

- variable = 5
- variable.is_a? Numeric        // true
- variable.kind_of?(Numeric)    // true
- variable.class                // returns its Class, so its type

Check length of an array

1. Setting the array in page.html.haml or in /data/tabs.yml

   ---
   tabs:
     - title: tab1
       href: #tab1
     - title: tab2
       href: #tab2
     - title: tab3 
       href: #tab3
   ---
   

2. Checking the length of the array from a page

   - data.page.tabs.length
   

3. Checking the length of the array from a data yaml file

   - data.tabs.length
   

Check and assign default value to a variable.
If the variable was set and has already a value, this will be kept.
Otherwise the variable will be set and assigned the passed value.

1. In a page or partial, we call a partial with or without variables

   = partial "components/article_overview/article_overview_unit"
   = partial(:"components/article_overview/article_overview_unit", :locals => { :is_teaser => true, :limit => 4 })
   

2. Initialize local variables. They can be set in the partial load or not.
   It is like: - limit = (defined? limit) ? limit : data.newsfeed.length. This way does not work.

   - limit ||= data.newsfeed.length
   - is_teaser ||= false