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 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Iterators"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "09116649",
   "metadata": {},
   "source": [
    "1. Use iterator methods to sum the values in a vector."
   ]
  },
  {
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   "id": "9fc4b114",
   "metadata": {
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   "source": [
    "fn main() {\n",
    "    let values = vec![1, 2, 3, 4];\n",
    "    let total: i32 = __;\n",
    "\n",
    "    assert_eq!(total, 10);\n",
    "    println!(\"Success!\");\n",
    "}\n",
    "\n",
    "main();\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "c1558bef",
   "metadata": {},
   "source": [
    "2. Transform each item using `map()` and collect the results into a new vector."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "3a7a9e2b",
   "metadata": {
    "vscode": {
     "languageId": "rust"
    }
   },
   "outputs": [],
   "source": [
    "fn main() {\n",
    "    let values = vec![1, 2, 3];\n",
    "    let doubled: Vec<i32> = __;\n",
    "\n",
    "    assert_eq!(doubled, vec![2, 4, 6]);\n",
    "    println!(\"Success!\");\n",
    "}\n",
    "\n",
    "main();\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "829e3f48",
   "metadata": {},
   "source": [
    "3. Filter the iterator to keep only even numbers."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "47285545",
   "metadata": {
    "vscode": {
     "languageId": "rust"
    }
   },
   "outputs": [],
   "source": [
    "fn main() {\n",
    "    let values = vec![1, 2, 3, 4, 5];\n",
    "    let evens: Vec<i32> = __;\n",
    "\n",
    "    assert_eq!(evens, vec![2, 4]);\n",
    "    println!(\"Success!\");\n",
    "}\n",
    "\n",
    "main();\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "545e9a65",
   "metadata": {},
   "source": [
    "4. Use `enumerate()` to find the index of the first value greater than 5."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "622ea110",
   "metadata": {
    "vscode": {
     "languageId": "rust"
    }
   },
   "outputs": [],
   "source": [
    "fn main() {\n",
    "    let values = vec![2, 4, 6, 8];\n",
    "    let idx = __;\n",
    "\n",
    "    assert_eq!(idx, Some(2));\n",
    "    println!(\"Success!\");\n",
    "}\n",
    "\n",
    "main();"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "fbde588e",
   "metadata": {},
   "source": [
    "5. Calculate sum of `Things` that are even using iterator adaptors\n",
    "   "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "3c3cd0dc",
   "metadata": {
    "vscode": {
     "languageId": "rust"
    }
   },
   "outputs": [],
   "source": [
    "#[derive(Clone, Debug, PartialEq, Eq)]\n",
    "struct Thing(u64);\n",
    "\n",
    "let collection: Vec<Thing> = vec![Thing(1), Thing(2), Thing(665), Thing(42), Thing(3), Thing(4)];\n",
    "\n",
    "let result: u64 = __;\n",
    "\n",
    "assert_eq!(result, 48);"
   ]
  }
 ],
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