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 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 1. Simple function"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "This is foo\n"
     ]
    }
   ],
   "source": [
    "def foo():\n",
    "    print(\"This is foo\")\n",
    "\n",
    "foo()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 2. Function with parameters"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Sum is  8\n"
     ]
    }
   ],
   "source": [
    "def bar(x, y):\n",
    "    print(\"Sum is \", x + y)\n",
    "    \n",
    "bar(3, 5)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 3. Default parameter value"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "__________\n",
      "________________________________________\n",
      "____________________\n"
     ]
    }
   ],
   "source": [
    "def drawLine(length = 10):\n",
    "    str = \"\"\n",
    "    for i in range(0, length):\n",
    "        str += \"_\"\n",
    "    print(str)\n",
    "\n",
    "drawLine()\n",
    "\n",
    "drawLine(40)\n",
    "\n",
    "drawLine(length=20)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 4. Lambda expressions"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello Alice!\n",
      "Hello Bob!\n"
     ]
    }
   ],
   "source": [
    "def greeter(val):\n",
    "  return lambda x: val + x\n",
    "\n",
    "greet = greeter(\"Hello \")\n",
    "\n",
    "print(greet(\"Alice!\"))\n",
    "print(greet(\"Bob!\"))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 5. Recursive functions"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The factorial of 4 is 24\n"
     ]
    }
   ],
   "source": [
    "def factorial(x):\n",
    "    if x == 1:\n",
    "        return 1\n",
    "    else:\n",
    "        return (x * factorial(x-1))\n",
    "\n",
    "x = 4\n",
    "print(\"The factorial of\", x, \"is\", factorial(x))"
   ]
  }
 ],
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