（误
class Object
class Proxy < BasicObject
def method_missing name, *args, &block
@target = @target.send(name, *args, &block)
end
def initialize target
@target = target
end
end
def pipe &block
Proxy.new(self).instance_eval &block
end
end
p [1,2,3].map{|x| %w{a b c d}[x] }.join.capitalize # => "Bcd"
[1,2,3].pipe do
map{|x| %w{a b c d}[x] }
join
capitalize
p self
end # => "Bcd"
再来一个
class DelayedMethod
attr_reader :proc_chain
def initialize proc
@proc_chain = [proc]
end
def >> another
@proc_chain.concat another.proc_chain
self
end
end
_ = Object.new
class << _
def method_missing name, *args, &block
DelayedMethod.new(->(x){ x.send(name, *args, &block ) })
end
def log
DelayedMethod.new(->(x){ p x })
end
end
class Object
def >> delayed_method
delayed_method.proc_chain.reduce(self){|acc, x| x.(acc)}
end
end
[1,2,3] >> _.map{|x| %w{a b c d}[x] } >> _.join >> _.capitalize >> _.log # => "Bcd"
