Gas savings - Variable initialization in loop

Gas savings - Variable initialization in loop.ipynb

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   "source": [
    "## Gas savings: variable declaration in loop"
   ]
  },
  {
   "cell_type": "code",
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   "outputs": [
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     "text": [
      "The boa.ipython extension is already loaded. To reload it, use:\n",
      "  %reload_ext boa.ipython\n"
     ]
    }
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   "source": [
    "%load_ext boa.ipython\n",
    "import boa"
   ]
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      "text/plain": [
       "<boa.contracts.vyper.vyper_contract.VyperDeployer at 0x106d5b340>"
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     "output_type": "display_data"
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   "source": [
    "%%vyper TestLoops\n",
    "\n",
    "@external\n",
    "def loop_with_init_inside():\n",
    "    for i in range(10):\n",
    "        a: uint256 = 0\n",
    "        a = i\n",
    "\n",
    "@external\n",
    "def loop_with_init_outside():\n",
    "    a: uint256 = 0\n",
    "    for i in range(10):\n",
    "        a = i\n"
   ]
  },
  {
   "cell_type": "code",
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      "text/plain": [
       "652"
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   ],
   "source": [
    "loops = TestLoops()\n",
    "loops.loop_with_init_inside()\n",
    "loops._computation.get_gas_used()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "603"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "loops = TestLoops()\n",
    "loops.loop_with_init_outside()\n",
    "loops._computation.get_gas_used()"
   ]
  }
 ],
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   "name": "python"
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