notebooks/Polyglot.ipynb

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   "source": [
    "The `scijava-jupyter-kernel` is polyglot which means you can use multiple languages in the same notebook. Available languages are : \n",
    "\n",
    "- Groovy\n",
    "- Python\n",
    "- BeanShell\n",
    "- Clojure\n",
    "- JavaScript\n",
    "- Scala\n",
    "\n",
    "All those script languages are executed by the [Scijava Scripting Mechanism](https://imagej.net/Scripting#Supported_languages). It means that any languages added to Scijava Script will work on `scijava-jupyter-kernel`.\n",
    "\n",
    "You can specify a language per cell with the following shebang-like syntax : `#!groovy`. It needs to be on the **first line** of the cell. If nothing is specified, Groovy is the default language or the last selected language is used. \n",
    "\n",
    "---\n",
    "\n",
    "Now let's see some of the specific feature of the scripting languages."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Groovy"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The Groovy version is 2.4.10\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "No Outputs"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "#!groovy\n",
    "println \"The Groovy version is \" + GroovySystem.version"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello Groovy!\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "No Outputs"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "class HelloWorld {\n",
    "   def greet( name ){\n",
    "      \"Hello ${name}!\"\n",
    "   }\n",
    "}\n",
    "\n",
    "def hm = new HelloWorld()\n",
    "println hm.greet(\"Groovy\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "2\n",
      "4\n",
      "6\n",
      "8\n",
      "10\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "No Outputs"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "def pickEven(n, block) {\n",
    "    for (int i=2; i <= n; i += 2) {\n",
    "        block(i)\n",
    "    }\n",
    "}\n",
    "\n",
    "pickEven(10) {\n",
    "    println it\n",
    "}"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Python"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "2.7.0 (default:9987c746f838, Apr 29 2015, 02:25:11) \n",
      "[Java HotSpot(TM) 64-Bit Server VM (Oracle Corporation)]\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "No Outputs"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "#!python\n",
    "import sys\n",
    "print(sys.version)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "('Rocket altitude:', 1)\n",
      "('Rocket altitude:', 0)\n",
      "('Rocket altitude:', 0)\n",
      "('Rocket altitude:', 0)\n",
      "('Rocket altitude:', 0)\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "No Outputs"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# Code is from http://introtopython.org/classes.html\n",
    "\n",
    "class Rocket(object):\n",
    "    # Rocket simulates a rocket ship for a game,\n",
    "    #  or a physics simulation.\n",
    "    \n",
    "    def __init__(self):\n",
    "        # Each rocket has an (x,y) position.\n",
    "        self.x = 0\n",
    "        self.y = 0\n",
    "        \n",
    "    def move_up(self):\n",
    "        # Increment the y-position of the rocket.\n",
    "        self.y += 1\n",
    "        \n",
    "# Create a fleet of 5 rockets, and store them in a list.\n",
    "my_rockets = [Rocket() for x in range(0,5)]\n",
    "\n",
    "# Move the first rocket up.\n",
    "my_rockets[0].move_up()\n",
    "\n",
    "# Show that only the first rocket has moved.\n",
    "for rocket in my_rockets:\n",
    "    print(\"Rocket altitude:\", rocket.y)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Beanshell"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#!Beanshell\n",
    "printBanner();"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Hashtable hashtable = new Hashtable();\n",
    "Date date = new Date();\n",
    "hashtable.put( \"today\", date );\n",
    "\n",
    "// Print the current clock value\n",
    "print( System.currentTimeMillis() );\n",
    "\n",
    "// Loop\n",
    "for (int i=0; i<5; i++)\n",
    "    print(i);"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Clojure"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{:major 1, :minor 8, :incremental 0, :qualifier nil}\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "No Outputs"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "#!clojure\n",
    "(println *clojure-version*)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[3 -1 2 1/2]\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "No Outputs"
      ]
     },
     "execution_count": 14,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "(let [fn-list [+ - * /]]\n",
    "    (println ((apply juxt fn-list) 1 2)))\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Javascript"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello World :-)\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "No Outputs"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "#!javascript\n",
    "print(\"Hello World :-)\");"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Good day\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "No Outputs"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "time = 18\n",
    "\n",
    "if (time < 10) {\n",
    "    greeting = \"Good morning\";\n",
    "} else if (time < 20) {\n",
    "    greeting = \"Good day\";\n",
    "} else {\n",
    "    greeting = \"Good evening\";\n",
    "}\n",
    "\n",
    "print(greeting)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "BMW\n",
      "Volvo\n",
      "Saab\n",
      "Ford\n",
      "\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "No Outputs"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "var cars = [\"BMW\", \"Volvo\", \"Saab\", \"Ford\"];\n",
    "var text = \"\";\n",
    "\n",
    "for (var i = 0; i < cars.length; i++) {\n",
    "    text += cars[i] + \"\\n\";\n",
    "}\n",
    "\n",
    "print(text);"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Scala"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "Scala library version 2.12.1 -- Copyright 2002-2016, LAMP/EPFL and Lightbend, Inc."
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "#!scala\n",
    "scala.util.Properties.versionMsg"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "No Outputs"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "class Point(val xc: Int, val yc: Int) {\n",
    "   var x: Int = xc\n",
    "   var y: Int = yc\n",
    "   \n",
    "   def move(dx: Int, dy: Int) {\n",
    "      x = x + dx\n",
    "      y = y + dy\n",
    "      println(\"Point x location : \" + x);\n",
    "      println(\"Point y location : \" + y);\n",
    "   }\n",
    "}\n",
    "\n",
    "val pt = new Point(10, 20);\n",
    "// Move to a new location\n",
    "pt.move(10, 10);"
   ]
  }
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