{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 配列の整形"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[false, nil]"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "array = [false, nil, 0, '', []]\n",
    "array.select{|e| !e }"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[false, 0, \"\", []]\n",
      "[false, nil, 0, \"\", []]\n",
      "[false, 0, \"\", []]\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "[false, 0, \"\", []]"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "p(array.compact)\n",
    "p(array)\n",
    "\n",
    "p(array.compact!)\n",
    "array"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[4, 4.0, 2]\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "[4, 4, 4.0, 2]"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "array = [4, 4, 4.0, 2]\n",
    "p(array.uniq)\n",
    "array"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[4, 4.0, 2]\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "[4, 4.0, 2]"
      ]
     },
     "execution_count": 12,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "p(array.uniq!)\n",
    "array"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[3, 2, 4, 4]\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "[4, 4, 2, 3]"
      ]
     },
     "execution_count": 13,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "array = [4, 4, 2, 3]\n",
    "p array.reverse\n",
    "array"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[4, 4, 2, 3]\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "[4, [4, [2, 3]]]"
      ]
     },
     "execution_count": 14,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "array = [4, [4, [2, 3]]]\n",
    "p array.flatten\n",
    "array"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[2, 3, 4, 4]\n",
      "[2, 3, 4, 4]\n",
      "[\"fo\", \"foo\", \"fooo\", \"foooo\"]\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "[\"fo\", \"foo\", \"fooo\", \"foooo\"]"
      ]
     },
     "execution_count": 16,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "array = [4, 4, 2, 3]\n",
    "p array.sort!\n",
    "p array\n",
    "\n",
    "array = ['foooo', 'fooo', 'fo', 'foo']\n",
    "p array.sort_by! {|v| v.length}\n",
    "array"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "ename": "ArgumentError",
     "evalue": "comparison of Integer with String failed",
     "output_type": "error",
     "traceback": [
      "\u001b[31mArgumentError\u001b[0m: comparison of Integer with String failed",
      "\u001b[37m(pry):49:in `sort!'\u001b[0m",
      "\u001b[37m(pry):49:in `<main>'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:355:in `eval'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:355:in `evaluate_ruby'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:323:in `handle_line'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:243:in `block (2 levels) in eval'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:242:in `catch'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:242:in `block in eval'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:241:in `catch'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:241:in `eval'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/backend.rb:65:in `eval'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/backend.rb:12:in `eval'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/kernel.rb:87:in `execute_request'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/kernel.rb:47:in `dispatch'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/kernel.rb:37:in `run'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/command.rb:70:in `run_kernel'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/command.rb:34:in `run'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/bin/iruby:5:in `<top (required)>'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/bin/iruby:22:in `load'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/bin/iruby:22:in `<main>'\u001b[0m"
     ]
    }
   ],
   "source": [
    "array = [4, '4', 2, 3]\n",
    "array.sort!"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[2, 3, 4, \"4\"]"
      ]
     },
     "execution_count": 18,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "array.sort_by! {|v| v.to_i }"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[2, 3, 4, 4]"
      ]
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "array.map(&:to_i).sort!"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[\"ZELDA\", \"LINK\", \"GANON\"]"
      ]
     },
     "execution_count": 20,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "people = %w(zelda link ganon)\n",
    "people.map!{|person| person.upcase}\n",
    "people"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[\"ZELDA\", \"LINK\", \"GANON\"]"
      ]
     },
     "execution_count": 21,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "people = %w(zelda link ganon)\n",
    "people.map(&:upcase)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[[\"a\", 1], [\"b\", 2], [\"c\", 3]]\n"
     ]
    },
    {
     "ename": "TypeError",
     "evalue": "no implicit conversion of Integer into Array",
     "output_type": "error",
     "traceback": [
      "\u001b[31mTypeError\u001b[0m: no implicit conversion of Integer into Array",
      "\u001b[37m(pry):66:in `transpose'\u001b[0m",
      "\u001b[37m(pry):66:in `<main>'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:355:in `eval'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:355:in `evaluate_ruby'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:323:in `handle_line'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:243:in `block (2 levels) in eval'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:242:in `catch'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:242:in `block in eval'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:241:in `catch'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:241:in `eval'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/backend.rb:65:in `eval'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/backend.rb:12:in `eval'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/kernel.rb:87:in `execute_request'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/kernel.rb:47:in `dispatch'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/kernel.rb:37:in `run'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/command.rb:70:in `run_kernel'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/command.rb:34:in `run'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/bin/iruby:5:in `<top (required)>'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/bin/iruby:22:in `load'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/bin/iruby:22:in `<main>'\u001b[0m"
     ]
    }
   ],
   "source": [
    "array = [['a', 'b', 'c'], [1, 2, 3]]\n",
    "\n",
    "p array.transpose\n",
    "\n",
    "[1, 2, 3, 4].transpose"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "ename": "IndexError",
     "evalue": "element size differs (3 should be 2)",
     "output_type": "error",
     "traceback": [
      "\u001b[31mIndexError\u001b[0m: element size differs (3 should be 2)",
      "\u001b[37m(pry):67:in `transpose'\u001b[0m",
      "\u001b[37m(pry):67:in `<main>'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:355:in `eval'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:355:in `evaluate_ruby'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:323:in `handle_line'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:243:in `block (2 levels) in eval'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:242:in `catch'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:242:in `block in eval'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:241:in `catch'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/pry-0.10.4/lib/pry/pry_instance.rb:241:in `eval'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/backend.rb:65:in `eval'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/backend.rb:12:in `eval'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/kernel.rb:87:in `execute_request'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/kernel.rb:47:in `dispatch'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/kernel.rb:37:in `run'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/command.rb:70:in `run_kernel'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/lib/iruby/command.rb:34:in `run'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/lib/ruby/gems/2.4.0/gems/iruby-0.2.9/bin/iruby:5:in `<top (required)>'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/bin/iruby:22:in `load'\u001b[0m",
      "\u001b[37m/Users/ariga/.rbenv/versions/2.4.0-preview2/bin/iruby:22:in `<main>'\u001b[0m"
     ]
    }
   ],
   "source": [
    "[['a', 'b'], [1, 2, 3]].transpose"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[[[1, 2], [5, 6], [9, 0]], [[3, 4], [7, 8], [1, 2]]]"
      ]
     },
     "execution_count": 25,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "array = [\n",
    "  [[1, 2], [3, 4]],\n",
    "  [[5, 6], [7, 8]],\n",
    "  [[9, 0], [1, 2]]\n",
    "]\n",
    "array.transpose"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[[1, 2, 3], [\"a\", \"b\", \"c\"]]"
      ]
     },
     "execution_count": 26,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "array = [1, 'a']\n",
    "array.zip([2, 'b'], [3, 'c'])"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "次回は ■二分探索 から"
   ]
  }
 ],
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