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Contents
== Module#class_extend
require 'facets/module/class_extend'
Module using class_extend
mix = Module.new do
def i ; end
class_extend do
def n ; 42 ; end
def s ; self ; end
end
end
Extends module
mix.n.assert == 42
mix.s.assert == mix
Has expected methods
mix.instance_methods.map{ |m| m.to_s }.assert == ['i']
transfers class methods to including class
mod = Module.new do
include mix
end
mod.n.assert == 42
mod.s.assert == mod
Doesn't overwrite instance methods
c = Class.new do
include mix
def n ; 11 ; end
end
c.new.n.assert == 11
Is overridable via including module
mod = Module.new do
include mix
class_extend do
def n ; super + 1 ; end
end
end
mod.n.assert == 43 # notice the difference!
mod.s.assert == mod
Transfers class methods thru multiple levels of include
alt = Module.new do
include mix
class_extend do
def n ; super + 1 ; end
end
end
mod = Module.new do
include alt
end
mod.n.assert == 43
mod.s.assert == mod
Version data entries
7 entries across 7 versions & 1 rubygems