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Contents
module Kernel
protected
#
# Magic "its" Mapping
# -------------------
#
# The pure-Ruby way:
# User.find(:all).map{|x| x.contacts.map{|y| y.last_name.capitalize }}
#
# With Symbol#to_proc:
# User.find(:all).map{|x|x.contacts.map(&:last_name).map(&:capitalize)}
#
# Magic "its" way:
# User.find(:all).map &its.contacts.map(&its.last_name.capitalize)
#
def it()
It.new
end
alias its it
end
class It < BasicObject # :nodoc:
#undef_method( *(instance_methods - ["__id__", "__send__"]) )
def initialize
@methods = []
end
def method_missing(*args, &block)
@methods << [args, block] unless args == [:respond_to?, :to_proc]
self
end
def to_proc
lambda do |obj|
@methods.inject(obj) do |current,(args,block)|
current.send(*args, &block)
end
end
end
end
Version data entries
144 entries across 144 versions & 1 rubygems