diff --git a/topic-1/task-1/index.js b/topic-1/task-1/index.js
index d76557c..5f4bf05 100644
--- a/topic-1/task-1/index.js
+++ b/topic-1/task-1/index.js
@@ -10,7 +10,10 @@
  * @returns 
  */
 
- function isTriangle(a, b, c) {
+ function isTriangle(a, b, c) 
+{
+    return ((a + b > c) && (a + c > b) && (b + c > a))
 }
 
-module.exports.isTriangle = isTriangle;
\ No newline at end of file
+module.exports.isTriangle = isTriangle;
+
diff --git a/topic-1/task-2/index.js b/topic-1/task-2/index.js
index 093141c..fa7b8fd 100644
--- a/topic-1/task-2/index.js
+++ b/topic-1/task-2/index.js
@@ -11,7 +11,23 @@
  * @param {*} array массив
  * @returns удвоенный массив
  */
- function calculateDoubleArray(array) {
-}
 
+ function calculateDoubleArray(array) 
+{
+    let doubledArray = [];
+    for (let i = 0; i < array.length; i++) 
+    {
+        if (array[i] === 0) 
+        {
+            doubledArray.splice(i,0);
+        }
+        else 
+        {
+            doubledArray.push(array[i]);
+            doubledArray.push(array[i]);
+        }
+
+    }
+    return doubledArray;
+}
 module.exports.calculateDoubleArray = calculateDoubleArray;
\ No newline at end of file
diff --git a/topic-1/task-3/index.js b/topic-1/task-3/index.js
index 7e12c79..47bba3a 100644
--- a/topic-1/task-3/index.js
+++ b/topic-1/task-3/index.js
@@ -10,6 +10,19 @@
 */
 
 function factorial(n) {
+    if (n < 0){
+        throw new Error("Value must be more than zero"); 
+    }
+    else if (n === 0) {
+        return 1;
+    }
+    else {
+        let result = n;
+        while (n > 1) {
+            n--;
+            result *= n;
+        }
+    return result;
+    }
 }
-
 module.exports.factorial = factorial;
\ No newline at end of file
diff --git a/topic-1/task-4/index.js b/topic-1/task-4/index.js
index da33ee2..0864e6e 100644
--- a/topic-1/task-4/index.js
+++ b/topic-1/task-4/index.js
@@ -7,6 +7,13 @@
  * @return {number} Количество уникальных имён
  * */
 function countUniqueName(nameArray) {
+    let names = [];
+        for (let word of nameArray) {
+            let highWord = word.toUpperCase();
+            if (!names.includes(highWord)) {
+                names.push(highWord);
+            }
+        }
+    return names.length;
 }
-
 module.exports.countUniqueName = countUniqueName;
\ No newline at end of file