countries/country_select

Checks for every useless assignment to local variable in every scope. The basic idea for this cop was from the warning of ruby -cw:

assigned but unused variable - foo

Currently this cop has advanced logic that detects unreferenced reassignments and properly handles varied cases such as branch, loop, rescue, ensure, etc.

Example:

# bad
 
def some_method
  some_var = 1
  do_something
end

Example:

# good
 
def some_method
  some_var = 1
  do_something(some_var)
end