{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Kotlin\n",
    "\n",
    "[Kotlin](https://kotlinlang.org/) is a relative newcomer from [JetBrains](https://www.jetbrains.com/) and [Android](https://developer.android.com/kotlin/get-started.html).  It's intended to an improved version of Java, including [Null Safety](https://kotlinlang.org/docs/reference/null-safety.html)."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "hello, 14\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "null"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "fun double(x: Int): Int {\n",
    "    return 2*x\n",
    "}\n",
    "\n",
    "println(\"hello, \" + double(3+4))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "null"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "val plot = Plot()\n",
    "plot.display()"
   ]
  }
 ],
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   "display_name": "Kotlin",
   "language": "kotlin",
   "name": "kotlin"
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