core-js-arrays

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# Core JS Arrays

:warning: **Please note that you mustn't open PRs that contains the answers to this repo!**

However, PRs with the fixes or proposals are welcomed!

## Task
The goal of the assignment is to learn how to work with arrays in JS.

**Active usage of [documentation](https://developer.mozilla.org/en-US/) is strongly recommended!**

## Prepare and test
1. Install Node.js
2. Fork this repository: https://github.com/rolling-scopes-school/core-js-arrays
3. Clone your newly created repo: `https://github.com/<%your_github_username%>/core-js-arrays/`
4. Go to folder `core-js-arrays`
5. To install all dependencies use `npm install`
6. Each task is usually a regular function:
    ```javascript
      /**
       * Returns the result of concatenation of two strings.
      *
      * @param {string} value1
      * @param {string} value2
      * @return {string}
      *
      * @example
      *   'aa', 'bb' => 'aabb'
      *   'aa',''    => 'aa'
      *   '',  'bb'  => 'bb'
      */
      function concatenateStrings(/* value1, value2 */) {
        throw new Error('Not implemented');
      }
    ```
    Read the task description in the comment above the function. Try to understand the idea. You can see the tests prepared if you don't understand it.
7. Write your code in `src/arrays-tasks.js`.

Uncomment the incoming parameters:

```javascript
        function concatenateStrings(/* value1, value2 */)
    ```

Remove the throwing error line from function body:
    ```javascript
        throw new Error('Not implemented'); 
    ```
    Implement the function by any way and verify your solution by running tests until the failed test become passed (green).
8. Save the solution and run `npm test` in command line. If everything is OK you can try to resolve the next task.
9. You will see the number of passing and pending tests.

## Submit to [rs app](https://app.rs.school/)
1. Commit and push your solutions to your fork
2. Open rs app and login
3. Go to submit task page
4. Select your task (Core JS Arrays)
5. Press submit button and enjoy

## Notes
* We recommend you to use nodejs of version 22. If you using any of features that does not supported by node `v22`, score won't be submitted.
* Installing nodejs `v22` is optional, you can run jobs using your version and not use methods that are not in nodejs `v22`.
* Please be sure that each of your test in limit of 30sec.
* You will get 0 (zero) if you have any eslint's errors or warnings.

## FAQ
**Question:** I use Windows machine and have received a lot of errors like "Expected linebreaks to be 'LF' but found 'CRLF'". How to handle it?

**Answer**:
- First, you need to install Gitbash properly: you need to choose option "Checkout as-is, commit as-is" in section "Configuring the line ending conversions". It'll let you download repos with line endings set "as-is" as well as commit. In other words, not to change them at all, because by default it converts them.
- Second, install `editorconfig` plugin to your editor. For VS Code you can find it here:
https://marketplace.visualstudio.com/items?itemName=EditorConfig.EditorConfig

I'll let you apply some rules when you saving your files in the repo. This plugin will use config-file `.editorconfig` that you can see in the root folder. It lets you save the file with needed line endings, trim whitespaces, etc.
- Finally, you need to apply linter's autofix feature in order to fix all linebreaks that was already changed to "CLRF":
```
$ npm run lint -- --fix
```

**Question:** Execution of tests "hangs" on one of them and does not display the result. What to do?<br>
**Answer**: Check your solution for an infinite loop, fix it, and rerun the test.

**Question:** The solution in the local repository succeeds and all tests are "green", but in the application some tests don't count. What to do?<br>
**Answer**: [Update your repository fork](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork), update the local repository from the fork, run tests and fix your solution. After fixing, resubmit your solution for testing.

___
The task based on https://github.com/rolling-scopes-school/js-assignments.

core-js-arrays

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