{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 10-1-2 オブジェクトが持つメソッドを調べる(続き)\n",
    "#### ■オブジェクトにメソッドが定義されているかを確認する"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "true\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "false"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "class HasMethod\n",
    "  def has_method\n",
    "    'has_method'\n",
    "  end\n",
    "end\n",
    "\n",
    "class NotHaveMethod\n",
    "end\n",
    "\n",
    "has_method = HasMethod.new\n",
    "not_have_method = NotHaveMethod.new\n",
    "\n",
    "p has_method.respond_to? :has_method\n",
    "not_have_method.respond_to? :has_method"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "false\n",
      "true\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "false"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "class HasPrivateMethod\n",
    "  private\n",
    "  def private_method\n",
    "    'private_method'\n",
    "  end\n",
    "end\n",
    "\n",
    "has_private_method = HasPrivateMethod.new\n",
    "\n",
    "p has_private_method.respond_to? :private_method\n",
    "p has_private_method.respond_to? :private_method, true  # give true for second argment\n",
    "has_private_method.respond_to? :private_method, false # give false for second argment"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\"respond_at_method_missing\"\n",
      "false\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "true"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "class RespondAtMethodMissing\n",
    "  def method_missing(method_name, *args)\n",
    "    if method_name == :respond_at_method_missing\n",
    "      'respond_at_method_missing'\n",
    "    else\n",
    "      super\n",
    "    end\n",
    "  end\n",
    "end\n",
    "\n",
    "respond_at_method_missing = RespondAtMethodMissing.new\n",
    "p respond_at_method_missing.respond_at_method_missing\n",
    "\n",
    "p respond_at_method_missing.respond_to? :respond_at_method_missing\n",
    "\n",
    "class RespondAtMethodMissing\n",
    "  def respond_to_missing?(method_name, include_private = false)\n",
    "    if method_name.to_sym == :respond_at_method_missing\n",
    "      true\n",
    "    else\n",
    "      super\n",
    "    end\n",
    "  end\n",
    "end\n",
    "\n",
    "respond_at_method_missing.respond_to? :respond_at_method_missing"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### ■メソッドの呼び出し"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\"hi\"\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "\"hello takkanm\""
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "class Hello\n",
    "  def hi\n",
    "    'hi'\n",
    "  end\n",
    "  \n",
    "  def hello(name)\n",
    "    \"hello #{name}\"\n",
    "  end\n",
    "end\n",
    "\n",
    "hello = Hello.new\n",
    "p hello.send :hi\n",
    "hello.send :hello, \"takkanm\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "ename": "ArgumentError",
     "evalue": "wrong number of arguments (given 1, expected 0)",
     "output_type": "error",
     "traceback": [
      "\u001b[31mArgumentError\u001b[0m: wrong number of arguments (given 1, expected 0)",
      "\u001b[37m(pry):108:in `hi'\u001b[0m",
      "\u001b[37m(pry):120:in `<main>'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:387:in `eval'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:387:in `evaluate_ruby'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:355:in `handle_line'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:274:in `block (2 levels) in eval'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:273:in `catch'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:273:in `block in eval'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:272:in `catch'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:272:in `eval'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/backend.rb:66:in `eval'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/backend.rb:12:in `eval'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/kernel.rb:87:in `execute_request'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/kernel.rb:47:in `dispatch'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/kernel.rb:37:in `run'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/command.rb:70:in `run_kernel'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/command.rb:34:in `run'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/bin/iruby:5:in `<top (required)>'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/bin/iruby:23:in `load'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/bin/iruby:23:in `<main>'\u001b[0m"
     ]
    }
   ],
   "source": [
    "hello.send :hi, \"foo\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "\"bye [\\\"btw\\\", \\\"who are you?\\\"]\""
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "class Hello\n",
    "  def bye(*args)\n",
    "    \"bye #{args}\"\n",
    "  end\n",
    "end\n",
    "\n",
    "hello.send :bye, \"btw\",\"who are you?\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "ename": "NoMethodError",
     "evalue": "protected method `protected_hello' called for #<Hello:0x00000006b44190>\nDid you mean?  protected_methods",
     "output_type": "error",
     "traceback": [
      "\u001b[31mNoMethodError\u001b[0m: protected method `protected_hello' called for #<Hello:0x00000006b44190>\nDid you mean?  protected_methods",
      "\u001b[37m(pry):168:in `<main>'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:387:in `eval'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:387:in `evaluate_ruby'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:355:in `handle_line'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:274:in `block (2 levels) in eval'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:273:in `catch'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:273:in `block in eval'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:272:in `catch'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:272:in `eval'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/backend.rb:66:in `eval'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/backend.rb:12:in `eval'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/kernel.rb:87:in `execute_request'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/kernel.rb:47:in `dispatch'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/kernel.rb:37:in `run'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/command.rb:70:in `run_kernel'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/command.rb:34:in `run'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/bin/iruby:5:in `<top (required)>'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/bin/iruby:23:in `load'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/bin/iruby:23:in `<main>'\u001b[0m"
     ]
    }
   ],
   "source": [
    "class Hello\n",
    "  protected\n",
    "  def protected_hello\n",
    "    'protected hello'\n",
    "  end\n",
    "  \n",
    "  private\n",
    "  def private_hello\n",
    "    'private hello'\n",
    "  end\n",
    "end\n",
    "\n",
    "hello = Hello.new\n",
    "\n",
    "hello.protected_hello"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\"protected hello\"\n"
     ]
    },
    {
     "ename": "NoMethodError",
     "evalue": "private method `private_hello' called for #<Hello:0x00000006b44190>\nDid you mean?  private_methods",
     "output_type": "error",
     "traceback": [
      "\u001b[31mNoMethodError\u001b[0m: private method `private_hello' called for #<Hello:0x00000006b44190>\nDid you mean?  private_methods",
      "\u001b[37m(pry):171:in `<main>'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:387:in `eval'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:387:in `evaluate_ruby'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:355:in `handle_line'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:274:in `block (2 levels) in eval'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:273:in `catch'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:273:in `block in eval'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:272:in `catch'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/pry-0.12.2/lib/pry/pry_instance.rb:272:in `eval'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/backend.rb:66:in `eval'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/backend.rb:12:in `eval'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/kernel.rb:87:in `execute_request'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/kernel.rb:47:in `dispatch'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/kernel.rb:37:in `run'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/command.rb:70:in `run_kernel'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/lib/iruby/command.rb:34:in `run'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/iruby-0.3/bin/iruby:5:in `<top (required)>'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/bin/iruby:23:in `load'\u001b[0m",
      "\u001b[37mC:/Ruby24-x64/bin/iruby:23:in `<main>'\u001b[0m"
     ]
    }
   ],
   "source": [
    "p hello.send :protected_hello\n",
    "\n",
    "hello.private_hello"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "\"private hello\""
      ]
     },
     "execution_count": 14,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "hello.send :private_hello"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\"send mail: takkanm@example.com\"\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "\"takkanm\""
      ]
     },
     "execution_count": 15,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "class MailSender\n",
    "  attr_reader :from\n",
    "  \n",
    "  def initialize(from)\n",
    "    @from = from\n",
    "  end\n",
    "  \n",
    "  def send(to)\n",
    "    \"send mail: #{to}\"\n",
    "  end\n",
    "end\n",
    "\n",
    "mail_sender = MailSender.new(\"takkanm\")\n",
    "\n",
    "p mail_sender.send 'takkanm@example.com'\n",
    "mail_sender.__send__ :from"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "次回 \"10-2 クラスについて調べる\" から"
   ]
  }
 ],
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