jehillert / 7-eleven-code-challenge

7-eleven challenge notes

Running the Solution

The basic startup instructions generated with the project are below. You should be able to use them to run locally without a problem.

Stories 1-3: The Pokemon Picker

The cart page mentioned "a summary view of the cart and selected Pokemon details". I assumed the details just referred to the name, picture, and quanity. But I was not sure, and that's the reason I kept all of the pokemon details in state. Normally, I would have kept only the details the app uses to avoid having a massive object in redux. Notes:

• The app retrieves the data immediately when it is open, but there is also a pull-to-refresh. I used Promise.allSettled (instead of Promise.all, which will stop if one fails) in combination with createAsynThunk;
• I use redux toolkits createSlice, primarily for reducers and actions. I manage request state using createAsyncThunk and the builder patter (addCase, matchCase)
• Apologies for the ugly commit messages. That's not how I write them working on a team.;
• My api call is not ideal. Large result sets take a while. If I had more time, I would have experimented with breaking up the individual pokemon requests into smaller batches, in combination with some sort of infinite scroll.

7-eleven-jehillert-pokemon-code-challenge-demo.mp4

Not-A-Bonus Story: Theming

I integrated a light and dark theme through styled-components. It is not the simplest way to theme, just a decent one if no UI libraries are being used and you want more control than React Navigation provides.

7-eleven-jehillert-pokemon-code-challenge-light-dark-mode.mp4

Large result set

This video shows the scrollview handling 500 results in state on my Pixel 7 Pro.

7-eleven-jehillert-pokemon-code-challenge-scrollview-500-results.mp4

Bonus Story: Bonus Story: Dynamic Pricing Based on Weight

Screen-2024-03-20-154319.mp4

Bonus Story: Bonus Story: Optimize Performance and User Experience

I did not set out to do this explicitly, but I did do some optimizations as I went along.

• memoization: with React: I did not do much here, other than wrap the renderItem for the flatlist on the checkout page. with redux-toolkit: I use createSelector every time I have derived data that goes just being a direct property on the slice. Some of them may be unnecessary.
• no work on caching, but the api call is nested in a toplevel use-effect that only calls on mount (empty dependency array), I implmented pull-to refresh on the scrollview.

Bonus Story: Show the Ability to Log

I implemented Sentry basic logging, but with the following additional functionality:

• Sentry takes a screenshot of the UI where the error occurred;
• Sentry middleware provides all of the actions leading up to an error in breadcrumbs;

I did not have time to implement environment variables, but this code can be run in the following branch with a valid SENTRY_DSN.

this link shows the app logging locally in development, and sending logs to the project hosted on Sentries website.

Branch https://github.com/jehillert/7-eleven-code-challenge/tree/sentry-integration

To run Create a file src/appConfig with the following content:

export const SENTRY_ENDPOINT =
  'HTTPS://YOUR_VALID_SENTRY_DSN_HERE';
export const APP_BUILD = '1';
export const APP_VERSION = '0.0';
export const SENTRY_ENABLED = 'true';

Bonus Story: Create an API using RTK Query and Entity Adapter

I did not set out to do this explicitly, but these are things I did that overlap:

• Pokemon are all mostly managed by createEntityAdapter. I made the following entity:

export type PokemonBaseEntity = {
  name: string; // pokemon name
  weight?: number | null; // pulled form data, if api call to retrieve particular pokemon data is successful.
  imageUrl?: string; // same as line above
  error?: string; // If an error occurs when retrieving a particular pokemon, the serialized error is recorded here.
  url: string; // pokemon data url, probably no reason to store this given requirements
};
- I did not use RTK Query, but I did use `createAsyncThunk()` and took advantage of the functionality it provides for tracking progress of the api call (e.g., 'idle' | 'pending' | 'succeeded' | 'failed'), recording errors, showing a loader.

Additional Notes

Printout of State Tree

This is what my state tree looks like after fetching data. I probably could have removed a few fields from the Pokemon entities to keep state smaller.

{
  "pokemon": {
    "ids": [
      "_UwoFodOlR_XxNUsqtkrg",
      "pjsqdXbqW_UHjA4Sawq9x",
      "c5-pK1cqnidUb0NDn4MpI",
      "r_NuoZ1npfKtFzGpei4-Y",
      "BTWAjOmIkb4j7oE4wEiVY",
      "RIrPevuojo5bE82tmZOPQ",
      "Mb4vWCL4EZZ_8rO1TZCLs",
      "dDmsGFaxT6FpbvNAC4Ep2",
      "QjkOGmFfJo01G1iJ89MEH",
      "5DQWjX1gpdEHcZQgpNWRu",
      "F1-ESS5rtBJ1h62tZA810",
      "iYA8HIkgHFjtsUonTD2PG",
      "xUFYEyCNQkQFzbEXsNZ0Q",
      "Uio6-FbSBMuS1QP1M2c38",
      "MUQMAKm6e90_sFLen5566",
      "bkfCIKFIiotNN0p1HF30p",
      "gANUdKH3hg4mWKgoX3bcp",
      "ypre_tp3KZ_W0JTdYuxKN",
      "BDXfAKkwkT_diE-C4LXCB",
      "fr18zziI_yeXhM9tdzbH6"
    ],
    "entities": {
      "_UwoFodOlR_XxNUsqtkrg": {
        "name": "bulbasaur",
        "url": "https://pokeapi.co/api/v2/pokemon/1/",
        "cartCount": 0,
        "id": "_UwoFodOlR_XxNUsqtkrg",
        "weight": 69,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/1.png",
        "error": ""
      },
      "pjsqdXbqW_UHjA4Sawq9x": {
        "name": "ivysaur",
        "url": "https://pokeapi.co/api/v2/pokemon/2/",
        "cartCount": 0,
        "id": "pjsqdXbqW_UHjA4Sawq9x",
        "weight": 130,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/2.png",
        "error": ""
      },
      "c5-pK1cqnidUb0NDn4MpI": {
        "name": "venusaur",
        "url": "https://pokeapi.co/api/v2/pokemon/3/",
        "cartCount": 0,
        "id": "c5-pK1cqnidUb0NDn4MpI",
        "weight": 1000,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/3.png",
        "error": ""
      },
      "r_NuoZ1npfKtFzGpei4-Y": {
        "name": "charmander",
        "url": "https://pokeapi.co/api/v2/pokemon/4/",
        "cartCount": 0,
        "id": "r_NuoZ1npfKtFzGpei4-Y",
        "weight": 85,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/4.png",
        "error": ""
      },
      "BTWAjOmIkb4j7oE4wEiVY": {
        "name": "charmeleon",
        "url": "https://pokeapi.co/api/v2/pokemon/5/",
        "cartCount": 0,
        "id": "BTWAjOmIkb4j7oE4wEiVY",
        "weight": 190,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/5.png",
        "error": ""
      },
      "RIrPevuojo5bE82tmZOPQ": {
        "name": "charizard",
        "url": "https://pokeapi.co/api/v2/pokemon/6/",
        "cartCount": 0,
        "id": "RIrPevuojo5bE82tmZOPQ",
        "weight": 905,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/6.png",
        "error": ""
      },
      "Mb4vWCL4EZZ_8rO1TZCLs": {
        "name": "squirtle",
        "url": "https://pokeapi.co/api/v2/pokemon/7/",
        "cartCount": 0,
        "id": "Mb4vWCL4EZZ_8rO1TZCLs",
        "weight": 90,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/7.png",
        "error": ""
      },
      "dDmsGFaxT6FpbvNAC4Ep2": {
        "name": "wartortle",
        "url": "https://pokeapi.co/api/v2/pokemon/8/",
        "cartCount": 0,
        "id": "dDmsGFaxT6FpbvNAC4Ep2",
        "weight": 225,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/8.png",
        "error": ""
      },
      "QjkOGmFfJo01G1iJ89MEH": {
        "name": "blastoise",
        "url": "https://pokeapi.co/api/v2/pokemon/9/",
        "cartCount": 0,
        "id": "QjkOGmFfJo01G1iJ89MEH",
        "weight": 855,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/9.png",
        "error": ""
      },
      "5DQWjX1gpdEHcZQgpNWRu": {
        "name": "caterpie",
        "url": "https://pokeapi.co/api/v2/pokemon/10/",
        "cartCount": 0,
        "id": "5DQWjX1gpdEHcZQgpNWRu",
        "weight": 29,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/10.png",
        "error": ""
      },
      "F1-ESS5rtBJ1h62tZA810": {
        "name": "metapod",
        "url": "https://pokeapi.co/api/v2/pokemon/11/",
        "cartCount": 0,
        "id": "F1-ESS5rtBJ1h62tZA810",
        "weight": 99,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/11.png",
        "error": ""
      },
      "iYA8HIkgHFjtsUonTD2PG": {
        "name": "butterfree",
        "url": "https://pokeapi.co/api/v2/pokemon/12/",
        "cartCount": 0,
        "id": "iYA8HIkgHFjtsUonTD2PG",
        "weight": 320,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/12.png",
        "error": ""
      },
      "xUFYEyCNQkQFzbEXsNZ0Q": {
        "name": "weedle",
        "url": "https://pokeapi.co/api/v2/pokemon/13/",
        "cartCount": 0,
        "id": "xUFYEyCNQkQFzbEXsNZ0Q",
        "weight": 32,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/13.png",
        "error": ""
      },
      "Uio6-FbSBMuS1QP1M2c38": {
        "name": "kakuna",
        "url": "https://pokeapi.co/api/v2/pokemon/14/",
        "cartCount": 0,
        "id": "Uio6-FbSBMuS1QP1M2c38",
        "weight": 100,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/14.png",
        "error": ""
      },
      "MUQMAKm6e90_sFLen5566": {
        "name": "beedrill",
        "url": "https://pokeapi.co/api/v2/pokemon/15/",
        "cartCount": 0,
        "id": "MUQMAKm6e90_sFLen5566",
        "weight": 295,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/15.png",
        "error": ""
      },
      "bkfCIKFIiotNN0p1HF30p": {
        "name": "pidgey",
        "url": "https://pokeapi.co/api/v2/pokemon/16/",
        "cartCount": 0,
        "id": "bkfCIKFIiotNN0p1HF30p",
        "weight": 18,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/16.png",
        "error": ""
      },
      "gANUdKH3hg4mWKgoX3bcp": {
        "name": "pidgeotto",
        "url": "https://pokeapi.co/api/v2/pokemon/17/",
        "cartCount": 0,
        "id": "gANUdKH3hg4mWKgoX3bcp",
        "weight": 300,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/17.png",
        "error": ""
      },
      "ypre_tp3KZ_W0JTdYuxKN": {
        "name": "pidgeot",
        "url": "https://pokeapi.co/api/v2/pokemon/18/",
        "cartCount": 0,
        "id": "ypre_tp3KZ_W0JTdYuxKN",
        "weight": 395,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/18.png",
        "error": ""
      },
      "BDXfAKkwkT_diE-C4LXCB": {
        "name": "rattata",
        "url": "https://pokeapi.co/api/v2/pokemon/19/",
        "cartCount": 0,
        "id": "BDXfAKkwkT_diE-C4LXCB",
        "weight": 35,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/19.png",
        "error": ""
      },
      "fr18zziI_yeXhM9tdzbH6": {
        "name": "raticate",
        "url": "https://pokeapi.co/api/v2/pokemon/20/",
        "cartCount": 0,
        "id": "fr18zziI_yeXhM9tdzbH6",
        "weight": 185,
        "imageUrl": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/20.png",
        "error": ""
      }
    },
    "loading": "idle",
    "requestError": null
  },
  "settings": {
    "themeId": "system"
  }

This is a new React Native project, bootstrapped using @react-native-community/cli.

Getting Started

Note: Make sure you have completed the React Native - Environment Setup instructions till "Creating a new application" step, before proceeding.

Step 1: Start the Metro Server

First, you will need to start Metro, the JavaScript bundler that ships with React Native.

To start Metro, run the following command from the root of your React Native project:

# using npm
npm start

# OR using Yarn
yarn start

Step 2: Start your Application

Let Metro Bundler run in its own terminal. Open a new terminal from the root of your React Native project. Run the following command to start your Android or iOS app:

For Android

# using npm
npm run android

# OR using Yarn
yarn android

For iOS

# using npm
npm run ios

# OR using Yarn
yarn ios

If everything is set up correctly, you should see your new app running in your Android Emulator or iOS Simulator shortly provided you have set up your emulator/simulator correctly.

This is one way to run your app — you can also run it directly from within Android Studio and Xcode respectively.

Step 3: Modifying your App

Now that you have successfully run the app, let's modify it.

1. Open App.tsx in your text editor of choice and edit some lines.

2. For Android: Press the R key twice or select "Reload" from the Developer Menu (Ctrl + M (on Window and Linux) or Cmd ⌘ + M (on macOS)) to see your changes!

   For iOS: Hit Cmd ⌘ + R in your iOS Simulator to reload the app and see your changes!

Congratulations! 🎉

You've successfully run and modified your React Native App. 🥳

Now what?

• If you want to add this new React Native code to an existing application, check out the Integration guide.
• If you're curious to learn more about React Native, check out the Introduction to React Native.

Troubleshooting

If you can't get this to work, see the Troubleshooting page.

Learn More

To learn more about React Native, take a look at the following resources:

• React Native Website - learn more about React Native.
• Getting Started - an overview of React Native and how setup your environment.
• Learn the Basics - a guided tour of the React Native basics.
• Blog - read the latest official React Native Blog posts.
• @facebook/react-native - the Open Source; GitHub repository for React Native.