Created
March 15, 2011 22:45
-
-
Save portableworld/871679 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
class Hash | |
# By default, only instances of Hash itself are extractable. | |
# Subclasses of Hash may implement this method and return | |
# true to declare themselves as extractable. If a Hash | |
# is extractable, Array#extract_options! pops it from | |
# the Array when it is the last element of the Array. | |
def extractable_options? | |
instance_of?(Hash) | |
end | |
end | |
class Array | |
# Extracts options from a set of arguments. Removes and returns the last | |
# element in the array if it's a hash, otherwise returns a blank hash. | |
# | |
# def options(*args) | |
# args.extract_options! | |
# end | |
# | |
# options(1, 2) # => {} | |
# options(1, 2, :a => :b) # => {:a=>:b} | |
def extract_options! | |
if last.is_a?(Hash) && last.extractable_options? | |
pop | |
else | |
{} | |
end | |
end | |
end |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment