Solution

.github/workflows/test.yml-template

@@ -0,0 +1,23 @@
+name: Test
+
+on:
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [20.x]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: npm install
+    - run: npm test

package.json

@@ -17,7 +17,7 @@
   "license": "GPL-3.0",
   "devDependencies": {
     "@mate-academy/eslint-config": "latest",
-    "@mate-academy/scripts": "^1.8.6",
+    "@mate-academy/scripts": "^1.9.12",
     "eslint": "^8.57.0",
     "eslint-plugin-jest": "^28.6.0",
     "eslint-plugin-node": "^11.1.0",

src/formatDate.js

@@ -8,7 +8,49 @@
  * @returns {string}
  */
 function formatDate(date, fromFormat, toFormat) {
-  // write code here
+  const splitFromFormat = fromFormat[3];
+  const splitDate = date.split(splitFromFormat);
+
+  let day = '';
+  let month = '';
+  let year = '';
+
+  for (let i = 0; i < fromFormat.length; i++) {
+    if (fromFormat[i] === 'YYYY') {
+      year = splitDate[i];
+    } else if (fromFormat[i] === 'YY') {
+      if (parseInt(splitDate[i]) < 30) {
+        year = `20${splitDate[i]}`;
+      } else {
+        year = `19${splitDate[i]}`;
+      }
+    } else if (fromFormat[i] === 'MM') {
+      month = splitDate[i];
+    } else if (fromFormat[i] === 'DD') {
+      day = splitDate[i];
+    }
+  }
+
+  let newDate = '';
+
+  for (let i = 0; i < toFormat.length; i++) {
+    if (toFormat[i] === 'YYYY') {
+      newDate += year;
+    } else if (toFormat[i] === 'MM') {
+      newDate += month;
+    } else if (toFormat[i] === 'DD') {
+      newDate += day;
+    } else if (toFormat[i] === 'YY') {
+      year = year.slice(2);
+      newDate += year;
+    }
+
+    if (i < toFormat.length - 2) {
+      newDate += toFormat[3];
+    }
+  }
+
+  return newDate;
 }
 
 module.exports = formatDate;