Example: Creating a hash of HTML status codes from an Array

Nu Ideas - each_with_object

status_codes = [['OK',200], ['Created', 201], 
['Accepted', 202], ['Moved Permanently', 301], 
['Found', 302], ['Not Modified', 304]]

# Create Hash via inject
status_codes.inject({}) do |result, (description, value)|
  key = description.downcase.gsub(' ','_')
  result[key] = value
  result # Explicit return of the hash
end

# Create Hash with each_with_object
status_codes.each_with_object({}) do |(description, value), result|
  key = description.downcase.gsub(' ','_')    
  result[key] = value
end