chef

https://github.com/opscode/chef

Ruby

A systems integration framework, built to bring the benefits of configuration management to your entire infrastructure.

Chef::Node#attribute?

Return true if this Node has a given attribute, false if not.  Takes either a symbol or
a string.

Only works on the top level. Preferred way is to use the normal [] style
lookup and call attribute?()

Source | Google | Stack overflow

Edit

git clone [email protected]:opscode/chef.git
cd chef
open lib/chef/node.rb

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-Chef--Node-attribute--for-pr

# Commit to git

git add lib/chef/node.rbgit commit -m "better docs for Chef::Node#attribute?"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-Chef--Node-attribute--for-pr

hub pull-request

# Celebrate!