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Contents
# TITLE:
#
# Curry
#
# DESCRIPTION:
#
# Simple currying library.
#
# COPYRIGHT:
#
# Copyright (c) 2007 Thomas Sawyer
#
# LICENSE:
#
# Ruby License
#
# This module is free software. You may use, modify, and/or redistribute this
# software under the same terms as Ruby.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.
#
# AUTHORS:
#
# - 7rans (Thomas Sawyer)
# MissingArgument class is used to represent a curry hole.
class MissingArgument < ArgumentError
end
# Convenience method for curry hold (ie. MissingArgument)
def __
MissingArgument
end
class Proc
# Curry Proc object into new Proc object.
def curry(*args)
Proc.new do |*spice|
result = args.collect do |a|
MissingArgument == a ? spice.pop : a
end
call(*result)
end
end
end
class Method
# Curry a Method into a new Proc.
def curry(*args)
Proc.new do |*spice|
result = args.collect do |a|
MissingArgument == a ? spice.pop : a
end
call(*result)
end
end
end
=begin test
require 'test/unit'
class TestCurry < Test::Unit::TestCase
def setup
@p = Proc.new{ |a,b,c| a + b + c }
end
def test_first
n = @p.curry(__,2,3)
assert_equal( 6, n[1] )
end
def test_second
n = @p.curry(1,__,3)
assert_equal( 6, n[2] )
end
def test_third
n = @p.curry(1,2,__)
assert_equal( 6, n[3] )
end
end
=end
Version data entries
12 entries across 12 versions & 1 rubygems