diff --git a/1-module/1-task/index.js b/1-module/1-task/index.js
index 977f6f3..e165fd0 100644
--- a/1-module/1-task/index.js
+++ b/1-module/1-task/index.js
@@ -1,3 +1,12 @@
 function factorial(n) {
-  // ваш код...
+  if (n < 0) {
+    return undefined;
+  }
+  let result = 1;
+  let i = 2;
+  while (i <= n) {
+    result *=i;
+    i++;
+  }
+  return result;
 }
diff --git a/1-module/2-task/index.js b/1-module/2-task/index.js
index e59bf21..7d26fdb 100644
--- a/1-module/2-task/index.js
+++ b/1-module/2-task/index.js
@@ -10,13 +10,22 @@ function print(text) {
  * чтобы функция sayHello работала корректно
  */
 function isValid(name) {
-  // ваш код...
-}
+  if (!name) {
+    return false;
+  }
+  if (name.includes (" ")) {
+    return false;
+  }
+  if (name.length < 4) {
+    return false;
+  }
+    return true;
+  };// ваш код...
 
 function sayHello() {
   let userName = prompt('Введите ваше имя');
 
-  if (isValid(userName)) {
+  if (isValid (userName) ) {
     print(`Welcome back, ${userName}!`);
   } else {
     print('Некорректное имя');
diff --git a/1-module/3-task/index.js b/1-module/3-task/index.js
index 5c3e6a5..066ed8e 100644
--- a/1-module/3-task/index.js
+++ b/1-module/3-task/index.js
@@ -1,3 +1,4 @@
 function ucFirst(str) {
-  // ваш код...
+  if (!str) return str;
+  return str [0].toUpperCase() + str.slice (1);// ваш код...
 }
diff --git a/1-module/4-task/index.js b/1-module/4-task/index.js
index 08684b7..df40313 100644
--- a/1-module/4-task/index.js
+++ b/1-module/4-task/index.js
@@ -1,3 +1,4 @@
 function checkSpam(str) {
-  // ваш код...
+  const lowerStr = str.toLowerCase();
+  return lowerStr.includes ("1xbet") || lowerStr.includes ("xxx") // ваш код...
 }
diff --git a/1-module/5-task/index.js b/1-module/5-task/index.js
index b1eda21..357d6d9 100644
--- a/1-module/5-task/index.js
+++ b/1-module/5-task/index.js
@@ -1,3 +1,6 @@
 function truncate(str, maxlength) {
-  // ваш код...
+  if (str. length > maxlength) {
+    return str. slice (0, maxlength -1) + "…";// ваш код...
 }
+return str
+}
\ No newline at end of file
diff --git a/2-module/1-task/index.js b/2-module/1-task/index.js
index 5afaa84..7a75b10 100644
--- a/2-module/1-task/index.js
+++ b/2-module/1-task/index.js
@@ -1,3 +1,10 @@
 function sumSalary(salaries) {
-  // ваш код...
+  let total = 0;
+  for (let key in salaries) {
+    let value = salaries [key];
+    if (typeof value === 'number' && isFinite (value) ) {
+      total +=value;
+    }
+  }
+      return total;// ваш код...
 }
diff --git a/2-module/2-task/index.js b/2-module/2-task/index.js
index 7f90874..f63e7b5 100644
--- a/2-module/2-task/index.js
+++ b/2-module/2-task/index.js
@@ -1,3 +1,6 @@
 function isEmpty(obj) {
-  // ваш код...
+ for (let key in obj) {
+  return false;
+ }
+ return true // ваш код...
 }
diff --git a/2-module/3-task/index.js b/2-module/3-task/index.js
index 7bc6efd..1a9e631 100644
--- a/2-module/3-task/index.js
+++ b/2-module/3-task/index.js
@@ -1,5 +1,16 @@
 let calculator = {
-  // ваш код
+a: 0,
+b: 0,
+read (a, b) {
+  this.a = a;
+  this.b = b;
+},
+sum () {
+  return this.a + this.b;
+},
+mul () {
+  return this.a * this.b;
+}
 };
 
 // НЕ УДАЛЯТЬ СТРОКУ, НУЖНА ДЛЯ ПРОВЕРКИ