{
 "metadata": {
  "language": "ruby",
  "name": "",
  "signature": "sha256:f5253675e0a7dc7dc0899e458dd3a4d16cd6c49b885aee85d78351e08618d089"
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "# Kawasaki.rb 018 \u30d1\u30fc\u30d5\u30a7\u30af\u30c8Ruby\u8aad\u66f8\u4f1a\n",
      "## 3-5-8 \u30d6\u30ed\u30c3\u30af"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%w(kawasaki yokohama shibuya).each do |name|\n",
      "  puts \"#{name}.rb\"\n",
      "end"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "kawasaki.rb\n"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "yokohama.rb\n"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "shibuya.rb\n"
       ]
      },
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 1,
       "text": [
        "[\"kawasaki\", \"yokohama\", \"shibuya\"]"
       ]
      }
     ],
     "prompt_number": 1
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### yield"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "def block_sample\n",
      "  puts 'stand up'\n",
      "  yield\n",
      "  puts 'sit down'\n",
      "end\n",
      "\n",
      "block_sample do\n",
      "  puts 'walk'\n",
      "end"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "stand up\n"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "walk\n"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "sit down\n"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "block_sample"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "stand up\n"
       ]
      },
      {
       "ename": "LocalJumpError",
       "evalue": "no block given (yield)",
       "output_type": "pyerr",
       "traceback": [
        "\u001b[31mLocalJumpError\u001b[0m: no block given (yield)",
        "\u001b[37m(pry):6:in `block_sample'\u001b[0m",
        "\u001b[37m(pry):13:in `<main>'\u001b[0m",
        "\u001b[37m/Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:355:in `eval'\u001b[0m",
        "\u001b[37m/Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:355:in `evaluate_ruby'\u001b[0m",
        "\u001b[37m/Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:323:in `handle_line'\u001b[0m",
        "\u001b[37m/Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:243:in `block (2 levels) in eval'\u001b[0m",
        "\u001b[37m/Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:242:in `catch'\u001b[0m",
        "\u001b[37m/Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:242:in `block in eval'\u001b[0m",
        "\u001b[37m/Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:241:in `catch'\u001b[0m",
        "\u001b[37m/Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:241:in `eval'\u001b[0m",
        "\u001b[37m/Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/backend.rb:28:in `eval'\u001b[0m",
        "\u001b[37m/Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/kernel.rb:110:in `execute_request'\u001b[0m",
        "\u001b[37m/Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/kernel.rb:62:in `run'\u001b[0m",
        "\u001b[37m/Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/command.rb:30:in `run_kernel'\u001b[0m",
        "\u001b[37m/Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/command.rb:16:in `run'\u001b[0m",
        "\u001b[37m/Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/bin/iruby:6:in `<top (required)>'\u001b[0m",
        "\u001b[37m/Users/mic/.rbenv/versions/2.1.0/bin/iruby:23:in `load'\u001b[0m",
        "\u001b[37m/Users/mic/.rbenv/versions/2.1.0/bin/iruby:23:in `<main>'\u001b[0m"
       ]
      }
     ],
     "prompt_number": 3
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "def block_sample\n",
      "  puts 'stand up'\n",
      "  \n",
      "  yield if block_given?\n",
      "  \n",
      "  puts 'sit down'\n",
      "end\n",
      "\n",
      "block_sample"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "stand up\n"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "sit down\n"
       ]
      }
     ],
     "prompt_number": 4
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "block_sample do\n",
      "  puts 'hoge'\n",
      "end"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "stand up\n"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "hoge\n"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "sit down\n"
       ]
      }
     ],
     "prompt_number": 5
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### \u30d6\u30ed\u30c3\u30af\u306e\u623b\u308a\u5024\u30fb\u5f15\u6570\n",
      "`next`\u306f `yield`\u306b\u5024\u3092\u8fd4\u3059\u306e\u3067`42`\u304c`puts`\u3055\u308c\u308b"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "def display_value\n",
      "  puts yield\n",
      "end\n",
      "\n",
      "display_value do\n",
      "  next 42\n",
      "end"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "42\n"
       ]
      }
     ],
     "prompt_number": 11
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "`break` \u306f `yield` \u306b\u5165\u3063\u3066\u3059\u3050\u5b9f\u884c\u3055\u308c\u308b\u306e\u3067\u3001 `puts` \u306f\u3055\u308c\u305a\u3001`display_value` \u306e\u8fd4\u308a\u5024\u304c`42`\u306b\u306a\u308b"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "i = display_value do\n",
      "  break 42\n",
      "end"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 13,
       "text": [
        "42"
       ]
      }
     ],
     "prompt_number": 13
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "puts \"#{i}\u3067\u3059\u3088\""
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "42\u3067\u3059\u3088\n"
       ]
      }
     ],
     "prompt_number": 15
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "\u6b21\u56de\u3001P.98\u4e2d\u6bb5\u3088\u308a"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    }
   ],
   "metadata": {}
  }
 ]
}