{
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  {
   "cell_type": "markdown",
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   "metadata": {},
   "source": [
    "## Lambda Functions"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "54e5cd79",
   "metadata": {},
   "source": [
    "- Anonymous functions"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "91e2ddc0",
   "metadata": {},
   "source": [
    "### Find 3x+1"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "6cca3341",
   "metadata": {},
   "source": [
    "#### Traditional method"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "b5d6006b",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "7"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "def f(x):\n",
    "    return 3*x+1\n",
    "\n",
    "f(2)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "7bb39838",
   "metadata": {},
   "source": [
    "#### Lambda expression"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "111c59b8",
   "metadata": {},
   "source": [
    "- Syntax: lambda 0 or more inputs:expression that will be return value\n",
    "- Can't be used for multiline functions\n",
    "- Only used if functin can be written in 1 line\n",
    "    - Common applications are sorting and filtering data"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "5dcff8cf",
   "metadata": {},
   "source": [
    "- lambda : \"Hello world\"\n",
    "- lambda x:x\n",
    "- lambda x,y:x+y\n",
    "- lambda x,y,z:x+y+z"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "3c28406c",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "7"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "g=lambda x:3*x+1  # define\n",
    "g(2)              # call"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "e9aa7dd3",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'sahil s'"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "g=lambda x,y:x.strip()+' '+y.strip()\n",
    "g('sahil','s')"
   ]
  }
 ],
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