Sweep: Fix reace condition in getTopics() function in the App.js

Here's the PR! https://github.com/axelhellman/trivia/pull/6.

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Sandbox Execution ✓

Here are the sandbox execution logs prior to making any changes:

Sandbox logs for 17bf675

trunk fmt src/App.js || exit 0 1/4 ✓
 ✔ Formatted src/App.js
Re-checking autofixed files...

Checked 1 file
✔ No issues
trunk check --fix --print-failures src/App.js 2/4 ✓
Checked 1 file
✔ No issues
trunk fmt src/App.js || exit 0 3/4 ✓
Checked 1 file
✔ No issues
trunk check --fix --print-failures src/App.js 4/4 ✓
Checked 1 file
✔ No issues

Sandbox passed on the latest master, so sandbox checks will be enabled for this issue.

Step 1: 🔎 Searching

I found the following snippets in your repository. I will now analyze these snippets and come up with a plan.

Some code snippets I looked at (click to expand). If some file is missing from here, you can mention the path in the ticket description.

https://github.com/axelhellman/trivia/blob/17bf67555659e5520d3d19bd30fe94df255b9a38/src/App.js#L1-L197 https://github.com/axelhellman/trivia/blob/17bf67555659e5520d3d19bd30fe94df255b9a38/src/App.test.js#L1-L7 https://github.com/axelhellman/trivia/blob/17bf67555659e5520d3d19bd30fe94df255b9a38/src/App.js#L111-L197 https://github.com/axelhellman/trivia/blob/17bf67555659e5520d3d19bd30fe94df255b9a38/package.json#L1-L39 https://github.com/axelhellman/trivia/blob/17bf67555659e5520d3d19bd30fe94df255b9a38/src/index.css#L1-L113

Step 2: ⌨️ Coding

[X] Modify src/App.js ✓ https://github.com/axelhellman/trivia/commit/3bd693a5346b069f57276c335b7ddf48fe783604

Modify src/App.js with contents:
• In the `useEffect` hook that calls `getTopics`, declare a variable `isMounted` and set it to `true` at the start of the hook.
• Before calling `setTopics(data_array)`, check if `isMounted` is still `true`. If it is, proceed with the state update. If it's not, do not update the state.
• In the cleanup function of the `useEffect` hook, set `isMounted` to `false`. This will ensure that if the component unmounts before the state update completes, the update will be cancelled, thus preventing the race condition.
[X] Check src/App.js ✓ https://github.com/axelhellman/trivia/commit/d889648d8645a08b4c94f351a7f08ac230682834

Sandbox logs for https://github.com/axelhellman/trivia/commit/d889648d8645a08b4c94f351a7f08ac230682834

trunk fmt src/App.js || exit 0 1/2 ✓
 ✔ Formatted src/App.js
Re-checking autofixed files...

Checked 1 file
✔ No issues
trunk check --fix --print-failures src/App.js 2/2 ✓
Checked 1 file
✔ No issues

Step 3: 🔁 Code Review

I have finished reviewing the code for completeness. I did not find errors for sweep/fix-race-condition.

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axelhellman / trivia