Merge branch 'exercism:main' into main

.github/workflows/action-format.yml

@@ -12,11 +12,11 @@ jobs:
     steps:
       - name: 'Post acknowledgement that it will format code'
         continue-on-error: true # Never fail the build if this fails
-        uses: actions/github-script@d556feaca394842dc55e4734bf3bb9f685482fa0
+        uses: actions/github-script@d7906e4ad0b1822421a7e6a35d5ca353c962f410
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |
-            github.issues.createComment({
+            github.rest.issues.createComment({
               issue_number: context.issue.number,
               owner: context.repo.owner,
               repo: context.repo.repo,
@@ -34,7 +34,7 @@ jobs:
         id: fork_status
         run: |
           IS_FORK="$(jq '.head.repo.fork' "/tmp/pr.json")"
-          echo "::set-output name=fork::$IS_FORK"
+          echo "fork=$IS_FORK" >> "$GITHUB_OUTPUT"
 
       - name: 'Setup SSH deploy key'
         if: steps.fork_status.outputs.fork == 'false'
@@ -60,10 +60,10 @@ jobs:
           git clone $HEAD_REPO .
           git checkout -b "$HEAD_REF" "origin/$HEAD_REF"
 
-      - name: Use Node.js LTS (16.x)
-        uses: actions/setup-node@8c91899e586c5b171469028077307d293428b516
+      - name: Use Node.js LTS (18.x)
+        uses: actions/setup-node@5e21ff4d9bc1a8cf6de233a3057d20ec6b3fb69d
         with:
-          node-version: '16'
+          node-version: '18'
       - name: Install project development dependencies
         run: npm install --no-save
       - name: 'Format code'
@@ -88,11 +88,11 @@ jobs:
 
       - name: 'Post acknowledgement that it has formatted the code'
         continue-on-error: true # Never fail the build if this fails
-        uses: actions/github-script@d556feaca394842dc55e4734bf3bb9f685482fa0
+        uses: actions/github-script@d7906e4ad0b1822421a7e6a35d5ca353c962f410
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |
-            github.issues.createComment({
+            github.rest.issues.createComment({
               issue_number: context.issue.number,
               owner: context.repo.owner,
               repo: context.repo.repo,
@@ -102,11 +102,11 @@ jobs:
       - name: 'Post reminder to trigger build manually'
         continue-on-error: true # Never fail the build if this fails
         if: steps.fork_status.outputs.fork == 'true'
-        uses: actions/github-script@d556feaca394842dc55e4734bf3bb9f685482fa0
+        uses: actions/github-script@d7906e4ad0b1822421a7e6a35d5ca353c962f410
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |
-            github.issues.createComment({
+            github.rest.issues.createComment({
               issue_number: context.issue.number,
               owner: context.repo.owner,
               repo: context.repo.repo,

.github/workflows/action-sync.yml

@@ -12,11 +12,11 @@ jobs:
     steps:
       - name: 'Post acknowledgement that it will sync exercises'
         continue-on-error: true # Never fail the build if this fails
-        uses: actions/github-script@d556feaca394842dc55e4734bf3bb9f685482fa0
+        uses: actions/github-script@d7906e4ad0b1822421a7e6a35d5ca353c962f410
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |
-            github.issues.createComment({
+            github.rest.issues.createComment({
               issue_number: context.issue.number,
               owner: context.repo.owner,
               repo: context.repo.repo,
@@ -34,7 +34,7 @@ jobs:
         id: fork_status
         run: |
           IS_FORK="$(jq '.head.repo.fork' "/tmp/pr.json")"
-          echo "::set-output name=fork::$IS_FORK"
+          echo "fork=$IS_FORK" >> "$GITHUB_OUTPUT"
 
       - name: 'Setup SSH deploy key'
         if: steps.fork_status.outputs.fork == 'false'
@@ -84,11 +84,11 @@ jobs:
 
       - name: 'Post acknowledgement that it has synced the code'
         continue-on-error: true # Never fail the build if this fails
-        uses: actions/github-script@d556feaca394842dc55e4734bf3bb9f685482fa0
+        uses: actions/github-script@d7906e4ad0b1822421a7e6a35d5ca353c962f410
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |
-            github.issues.createComment({
+            github.rest.issues.createComment({
               issue_number: context.issue.number,
               owner: context.repo.owner,
               repo: context.repo.repo,
@@ -98,11 +98,11 @@ jobs:
       - name: 'Post reminder to trigger build manually'
         continue-on-error: true # Never fail the build if this fails
         if: steps.fork_status.outputs.fork == 'true'
-        uses: actions/github-script@d556feaca394842dc55e4734bf3bb9f685482fa0
+        uses: actions/github-script@d7906e4ad0b1822421a7e6a35d5ca353c962f410
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |
-            github.issues.createComment({
+            github.rest.issues.createComment({
               issue_number: context.issue.number,
               owner: context.repo.owner,
               repo: context.repo.repo,

.github/workflows/ci.js.yml

@@ -12,11 +12,11 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@755da8c3cf115ac066823e79a1e1788f8940201b
-      - name: Use Node.js LTS (16.x)
-        uses: actions/setup-node@8c91899e586c5b171469028077307d293428b516
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
+      - name: Use Node.js LTS (18.x)
+        uses: actions/setup-node@5e21ff4d9bc1a8cf6de233a3057d20ec6b3fb69d
         with:
-          node-version: '16'
+          node-version: '18'
 
       - name: Install project dependencies
         run: npm ci
@@ -29,12 +29,12 @@ jobs:
 
     strategy:
       matrix:
-        node-version: ['16', '17', '18']
+        node-version: ['18', '20']
 
     steps:
-      - uses: actions/checkout@755da8c3cf115ac066823e79a1e1788f8940201b
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@8c91899e586c5b171469028077307d293428b516
+        uses: actions/setup-node@5e21ff4d9bc1a8cf6de233a3057d20ec6b3fb69d
         with:
           node-version: ${{ matrix.node-version }}
 

.github/workflows/codeql.yml

@@ -29,7 +29,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@755da8c3cf115ac066823e79a1e1788f8940201b
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL

.github/workflows/pr.ci.js.yml

@@ -11,12 +11,12 @@ jobs:
 
     steps:
       - name: Checkout PR
-        uses: actions/checkout@755da8c3cf115ac066823e79a1e1788f8940201b
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
 
-      - name: Use Node.js LTS (16.x)
-        uses: actions/setup-node@8c91899e586c5b171469028077307d293428b516
+      - name: Use Node.js LTS (18.x)
+        uses: actions/setup-node@5e21ff4d9bc1a8cf6de233a3057d20ec6b3fb69d
         with:
-          node-version: '16'
+          node-version: '18'
 
       - name: Install project dependencies
         run: npm ci
@@ -33,14 +33,14 @@ jobs:
 
     strategy:
       matrix:
-        node-version: ['16', '17', '18']
+        node-version: ['18', '20']
 
     steps:
       - name: Checkout PR
-        uses: actions/checkout@755da8c3cf115ac066823e79a1e1788f8940201b
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
 
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@8c91899e586c5b171469028077307d293428b516
+        uses: actions/setup-node@5e21ff4d9bc1a8cf6de233a3057d20ec6b3fb69d
         with:
           node-version: ${{ matrix.node-version }}
 

.github/workflows/verify-code-formatting.yml

@@ -10,11 +10,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: 'Checkout code'
-        uses: actions/checkout@755da8c3cf115ac066823e79a1e1788f8940201b
-      - name: Use Node.js LTS (16.x)
-        uses: actions/setup-node@8c91899e586c5b171469028077307d293428b516
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
+      - name: Use Node.js LTS (18.x)
+        uses: actions/setup-node@5e21ff4d9bc1a8cf6de233a3057d20ec6b3fb69d
         with:
-          node-version: '16'
+          node-version: '18'
       - name: Install project development dependencies
         run: npm i
       - name: 'Verify formatting of all files'

.prettierignore

@@ -9,3 +9,4 @@ LICENSE
 
 # These are formatted via configlet and will not match prettier
 exercises/**/.meta/config.json
+exercises/**/.approaches/config.json

README.md

@@ -2,6 +2,10 @@
 
 [![configlet](https://github.com/exercism/javascript/workflows/configlet/badge.svg)](https://github.com/exercism/javascript/actions?query=workflow%3Aconfiglet) [![javascript / main](https://github.com/exercism/javascript/workflows/javascript%20/%20main/badge.svg)](https://github.com/exercism/javascript/actions?query=workflow%3A%22javascript+%2F+main%22)
 
+⚠️ We 💙 our community but **this repository does not accept community contributions at this time**.
+There are no active maintainers to review PRs.
+Please read this [community blog post][freeing-maintainers] for details. ⚠️
+
 **Exercism exercises in JavaScript**
 
 This is the JavaScript track, one of the many tracks on [Exercism][web-exercism].
@@ -93,3 +97,4 @@ A lot of the improvements made to this track and tooling are also made to the Ty
 [git-typescript-representer]: https://github.com/exercism/typescript-representer
 [git-typescript-test-runner]: https://github.com/exercism/typescript-test-runner
 [git-website-copy]: https://github.com/exercism/website-copy
+[freeing-maintainers]: https://exercism.org/blog/freeing-our-maintainers

concepts/array-transformations/about.md

@@ -61,7 +61,7 @@ arr.reduce(
 
     return accumulator;
   },
-  { even: [], odd: [] }
+  { even: [], odd: [] },
 );
 // => { even: [2, 4], odd: [1, 3] }
 ```
@@ -81,7 +81,7 @@ This method modifies the array it is called on.
 
 ### slice (pure)
 
-Given a start and an end index, creates a sub-array from the array passed as a parameter.
+Given a start and an end index, creates a sub-array from the array it is called on.
 
 The element at the end index will not be included.
 Also, all parameters are optional:

concepts/array-transformations/introduction.md

@@ -61,7 +61,7 @@ arr.reduce(
 
     return accumulator;
   },
-  { even: [], odd: [] }
+  { even: [], odd: [] },
 );
 // => { even: [2, 4], odd: [1, 3] }
 ```
@@ -81,7 +81,7 @@ This method modifies the array it is called on.
 
 ### slice (pure)
 
-Given a start and an end index, creates a sub-array from the array passed as a parameter.
+Given a start and an end index, creates a sub-array from the array it is called on.
 
 The element at the end index will not be included.
 Also, all parameters are optional:

concepts/arrays/about.md

@@ -31,7 +31,7 @@ The array's object properties and list of array elements are separate, and the a
 ```javascript
 const names = ['Jack', 'Laura', 'Paul', 'Megan'];
 names.length;
-// => 3
+// => 4
 
 // Properties can be set on arrays using bracket ['property'] or
 // dot .property notation, and this will affect the length, as

concepts/null-undefined/introduction.md

@@ -31,15 +31,38 @@ That means while `null` represents an empty value (but still a value), `undefine
 `undefined` appears in different contexts.
 
 - If a variable is declared without a value (initialization), it is `undefined`.
+
+  ```js
+  let name;
+  console.log(name); // => undefined
+  ```
+
 - If you try to access a value for a non-existing key in an object, you get `undefined`.
+
+  ```js
+  let obj = {
+    name: 'John',
+  };
+  console.log(obj.age); // => undefined
+  ```
+
 - If a function does not return a value, the result is `undefined`.
+
+  ```js
+  function printName(name) {
+    'My name is ' + name;
+  }
+  console.log(printName('John')); // => undefined
+  ```
+
 - If an argument is not passed to a function, it is `undefined`, unless that argument has a default value.
 
-```javascript
-let name;
-console.log(name);
-// => undefined
-```
+  ```js
+  function printName(name) {
+    return name;
+  }
+  console.log(printName()); // => undefined
+  ```
 
 You can check whether a variable is undefined using the strict equality operator `===`.
 

concepts/objects/introduction.md

@@ -76,6 +76,7 @@ obj[key];
 
 Using the dot notation as a shorthand has the same restriction as omitting the quotation marks.
 It only works if the key follows the identifier naming rules.
+In other words, if your key is not a single word using only letters, you must use square bracket notation.
 
 ## Adding or Changing a Value
 

concepts/promises/about.md

@@ -112,7 +112,7 @@ Promise.reject(new Error('failed')).then(
   },
   function (error) {
     console.error(error); // error in the console
-  }
+  },
 );
 ```
 
@@ -127,7 +127,7 @@ Promise.resolve('resolved!').then(
   },
   function (value) {
     // not called
-  }
+  },
 );
 ```
 

concepts/regular-expressions/about.md

@@ -73,7 +73,7 @@ _When to use one or the other?_ Use the `test()` when you want a fast way of che
 
 ### Test
 
-The [test()][mdn-regex-test]] method executes a search for a match between a regular expression and a specified string. Returns true or false.
+The [test()][mdn-regex-test] method executes a search for a match between a regular expression and a specified string. Returns true or false.
 
 ```javascript
 const str = 'It is difficult to test if you have a virus';