diff --git a/index.html b/index.html
index 9fb6740..71e135c 100644
--- a/index.html
+++ b/index.html
@@ -234,5 +234,7 @@ <h2 class="data-error__title">Не удалось загрузить данны
       </section>
     </template>
 
+  <script  src="./js/main.js" type="module"></script>
+
 </body>
 </html>
diff --git a/js/function.js b/js/function.js
new file mode 100644
index 0000000..b60ff75
--- /dev/null
+++ b/js/function.js
@@ -0,0 +1,136 @@
+function isLengthStr (str, length) {
+
+  if (str.length > length) {
+    return false;
+  }
+
+  return true;
+}
+
+function isPalindromeMetod (str) {
+  const normStr = str.trim().replace(/\s+/g, '').toUpperCase();
+  return normStr.split('').reverse().join('') === normStr;
+}
+
+function isPalindromeCycle (str) {
+  const normStr = str.trim().replaceAll(' ', '').toUpperCase();
+  const length = normStr.length;
+  const halfLength = Math.floor(normStr.length / 2);
+
+  for (let i = 0; i <= halfLength; i += 1) {
+    if (normStr[i] !== normStr[length - (i + 1)]) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+function getPositiveIntegeNumber (str) {
+  if (typeof str === 'number') {
+    str = String(str);
+  }
+
+  const items = str.split('');
+  let resultStr = '';
+
+  for (let i = 0; i < items.length; i += 1) {
+    if (items[i] >= '0' && items[i] <= '9') {
+      resultStr += items[i];
+    }
+  }
+
+  return Number(resultStr);
+}
+
+
+function getNumber (str) {
+  if (typeof str === 'number') {
+    str = String(str);
+  }
+
+  const resultStr = str.replace(/\D/g, '');
+
+  return resultStr;
+}
+
+isLengthStr();
+isPalindromeMetod();
+isPalindromeCycle();
+getPositiveIntegeNumber();
+getNumber();
+
+/* Решение дополнительных задач */
+
+/* 2626.Array Reduce Transform */
+function reduce (nums, fn, init) {
+  if (nums.length === 0) {
+    return init;
+  }
+
+  let result = init;
+
+  for (let i = 0; i < nums.length; i += 1) {
+    result = fn(result, nums[i]);
+  }
+
+  return result;
+}
+
+/* 2634.Filter Elements from Array */
+function filter (arr, fn) {
+  const result = [];
+
+  for (let i = 0; i < arr.length; i += 1) {
+    const value = fn(arr[i], i);
+
+    if (value) {
+      result.push(arr[i]);
+    }
+
+  }
+
+  return result;
+}
+
+/* 2620.Counter */
+function createCounter(n) {
+  let currentN = n;
+
+  return function() {
+    const saveCurrentN = currentN;
+    currentN += 1;
+    return saveCurrentN;
+  };
+}
+
+/* 2635.Apply Transform Over Each Element in Array */
+function map (arr, fn) {
+  const resultArr = [];
+
+  for (let i = 0; i < arr.length; i += 1) {
+    const item = fn(arr[i], i);
+    resultArr.push(item);
+  }
+
+  return resultArr;
+}
+
+/* 2648.Generate Fibonacci Sequence */
+const fibGenerator = function*() {
+  let previous = 0;
+  let current = 1;
+  while (true) {
+    yield previous;
+    const temp = current;
+    current = current + previous;
+    previous = temp;
+  }
+
+};
+
+reduce();
+filter();
+createCounter();
+map();
+fibGenerator();
diff --git a/js/main.js b/js/main.js
index e69de29..49b1478 100644
--- a/js/main.js
+++ b/js/main.js
@@ -0,0 +1,2 @@
+import './function.js';
+