{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 10-2-6 クラスやモジュールからインスタンスメソッドを削除す"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[:first_method, :second_method, :third_method, :forth_method]"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "class RemovedMethodClass\n",
    "  def first_method; end\n",
    "  def second_method; end\n",
    "  def third_method; end\n",
    "  def forth_method; end\n",
    "end\n",
    "\n",
    "RemovedMethodClass.instance_methods(false)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[:first_method, :forth_method]"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "RemovedMethodClass.class_eval do\n",
    "  remove_method :second_method, :third_method\n",
    "end\n",
    "\n",
    "RemovedMethodClass.instance_methods(false)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [
    {
     "ename": "NameError",
     "evalue": "method `undefined_method' not defined in RemovedMethodClass",
     "output_type": "error",
     "traceback": [
      "\u001b[31mNameError\u001b[0m: method `undefined_method' not defined in RemovedMethodClass",
      "<main>:1:in `remove_method'",
      "<main>:1:in `block in <main>'",
      "<main>:in `class_eval'",
      "<main>:in `<main>'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/backend.rb:44:in `eval'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/backend.rb:44:in `eval'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/backend.rb:12:in `eval'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/kernel.rb:90:in `execute_request'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/kernel.rb:49:in `dispatch'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/kernel.rb:38:in `run'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/command.rb:110:in `run_kernel'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/command.rb:40:in `run'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/bin/iruby:5:in `<top (required)>'",
      "/home/aki/.rbenv/versions/2.7.1/bin/iruby:23:in `load'",
      "/home/aki/.rbenv/versions/2.7.1/bin/iruby:23:in `<main>'"
     ]
    }
   ],
   "source": [
    "RemovedMethodClass.class_eval do\n",
    "  remove_method :undefined_method\n",
    "end"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 10-2-7 クラスやモジュールからインスタンスメソッドを未定義にする"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      ":inherite\n"
     ]
    },
    {
     "ename": "NoMethodError",
     "evalue": "undefined method `super_method' for #<InheriteClass:0x0000000001a15210>",
     "output_type": "error",
     "traceback": [
      "\u001b[31mNoMethodError\u001b[0m: undefined method `super_method' for #<InheriteClass:0x0000000001a15210>",
      "<main>:18:in `<main>'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/backend.rb:44:in `eval'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/backend.rb:44:in `eval'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/backend.rb:12:in `eval'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/kernel.rb:90:in `execute_request'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/kernel.rb:49:in `dispatch'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/kernel.rb:38:in `run'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/command.rb:110:in `run_kernel'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/command.rb:40:in `run'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/bin/iruby:5:in `<top (required)>'",
      "/home/aki/.rbenv/versions/2.7.1/bin/iruby:23:in `load'",
      "/home/aki/.rbenv/versions/2.7.1/bin/iruby:23:in `<main>'"
     ]
    }
   ],
   "source": [
    "class SuperClass\n",
    "  def super_method\n",
    "    :super_method\n",
    "  end\n",
    "end\n",
    "\n",
    "class InheriteClass < SuperClass\n",
    "  def super_method\n",
    "    :inherite\n",
    "  end\n",
    "end\n",
    "\n",
    "p InheriteClass.new.super_method\n",
    "\n",
    "class InheriteClass\n",
    "  undef_method :super_method\n",
    "end\n",
    "\n",
    "InheriteClass.new.super_method"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 10-3 Bindingに含まれる変数について調べる\n",
    "### 10-3-1 Bindingオブジェクトのselfを確認"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "#<BindingCreator:0x0000000001068de8>\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "true"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "class BindingCreator\n",
    "  def create_binding\n",
    "    a = 1\n",
    "    binding\n",
    "  end\n",
    "end\n",
    "\n",
    "creator = BindingCreator.new\n",
    "binding_object = creator.create_binding\n",
    "p binding_object.receiver\n",
    "creator == binding_object.receiver"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 10-3-2 Bindingオブジェクトに含まれる変数名を一覧"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[:a]\n",
      "true\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "false"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "p binding_object.local_variables\n",
    "p binding_object.local_variable_defined?(:a)\n",
    "binding_object.local_variable_defined?(:b)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1\n"
     ]
    },
    {
     "ename": "NameError",
     "evalue": "local variable `b' is not defined for #<Binding:0x0000000001068b18>",
     "output_type": "error",
     "traceback": [
      "\u001b[31mNameError\u001b[0m: local variable `b' is not defined for #<Binding:0x0000000001068b18>",
      "<main>:1:in `local_variable_get'",
      "<main>:1:in `<main>'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/backend.rb:44:in `eval'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/backend.rb:44:in `eval'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/backend.rb:12:in `eval'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/kernel.rb:90:in `execute_request'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/kernel.rb:49:in `dispatch'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/kernel.rb:38:in `run'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/command.rb:110:in `run_kernel'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/lib/iruby/command.rb:40:in `run'",
      "/home/aki/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/iruby-0.4.0/bin/iruby:5:in `<top (required)>'",
      "/home/aki/.rbenv/versions/2.7.1/bin/iruby:23:in `load'",
      "/home/aki/.rbenv/versions/2.7.1/bin/iruby:23:in `<main>'"
     ]
    }
   ],
   "source": [
    "p binding_object.local_variable_get(:a)\n",
    "p binding_object.local_variable_get(:b)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "2\n",
      "[:b, :a]\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "2"
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "p binding_object.local_variable_set(:b, 2)\n",
    "p binding_object.local_variables\n",
    "binding_object.local_variable_get(:b)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "次回「10-4 イベントをフックする」から"
   ]
  }
 ],
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