rubocop

https://github.com/bbatsov/rubocop

Ruby

A Ruby static code analyzer, based on the community Ruby style guide.

RuboCop::Node#pure?

Some expressions are evaluated for their value, some for their side
effects, and some for both
If we know that expressions are useful only for their return values, and
have no side effects, that means we can reorder them, change the number
of times they are evaluated, or replace them with other expressions which
are equivalent in value
So, is evaluation of this node free of side effects?

Source | Google | Stack overflow

Edit

git clone [email protected]:bbatsov/rubocop.git

cd rubocop

open lib/rubocop/ast_node.rb

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-RuboCop--Node-pure--for-pr

# Commit to git

git add lib/rubocop/ast_node.rbgit commit -m "better docs for RuboCop::Node#pure?"

# Open pull request

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

hub fork

git push <your name> -your-name--update-docs-RuboCop--Node-pure--for-pr

hub pull-request

# Celebrate!