diff --git a/1-js/04-object-basics/01-object/2-hello-object/solution.md b/1-js/04-object-basics/01-object/2-hello-object/solution.md
@@ -2,9 +2,9 @@

```js
let user = {};
-user.name = "John";
-user.surname = "Smith";
-user.name = "Pete";
delete user.name;
```

diff --git a/1-js/04-object-basics/01-object/2-hello-object/task.md b/1-js/04-object-basics/01-object/2-hello-object/task.md
@@ -2,13 +2,13 @@ importance: 5

---

-# Hello, object

-Write the code, one line for each action:

-1. Create an empty object `user`.
-2. Add the property `name` with the value `John`.
-3. Add the property `surname` with the value `Smith`.
-4. Change the value of the `name` to `Pete`.
-5. Remove the property `name` from the object.

diff --git a/1-js/04-object-basics/01-object/3-is-empty/_js.view/solution.js b/1-js/04-object-basics/01-object/3-is-empty/_js.view/solution.js
@@ -1,6 +1,6 @@
function isEmpty(obj) {
  for (let key in obj) {
-    // if the loop has started, there is a property
    return false;
  }
  return true;

diff --git a/1-js/04-object-basics/01-object/3-is-empty/_js.view/test.js b/1-js/04-object-basics/01-object/3-is-empty/_js.view/test.js
@@ -1,9 +1,9 @@
-describe("isEmpty", function() {
-  it("returns true for an empty object", function() {
    assert.isTrue(isEmpty({}));
  });

-  it("returns false if a property exists", function() {
    assert.isFalse(isEmpty({
      anything: false
    }));

diff --git a/1-js/04-object-basics/01-object/3-is-empty/task.md b/1-js/04-object-basics/01-object/3-is-empty/task.md
@@ -2,18 +2,18 @@ importance: 5

---

-# Check for emptiness

-Write the function `isEmpty(obj)` which returns `true` if the object has no properties, `false` otherwise.

-Should work like that:

```js
let schedule = {};

alert( isEmpty(schedule) ); // true

-schedule["8:30"] = "get up";

alert( isEmpty(schedule) ); // false
```

diff --git a/1-js/04-object-basics/01-object/5-sum-object/task.md b/1-js/04-object-basics/01-object/5-sum-object/task.md
@@ -2,9 +2,9 @@ importance: 5

---

-# Sum object properties

-We have an object storing salaries of our team:

```js
let salaries = {
@@ -14,6 +14,6 @@ let salaries = {
}
```

-Write the code to sum all salaries and store in the variable `sum`. Should be `390` in the example above.

-If `salaries` is empty, then the result must be `0`.
diff --git a/1-js/04-object-basics/01-object/8-multiply-numeric/_js.view/source.js b/1-js/04-object-basics/01-object/8-multiply-numeric/_js.view/source.js
@@ -1,13 +1,13 @@
let menu = {
  width: 200,
  height: 300,
-  title: "My menu"
};


function multiplyNumeric(obj) {

-  /* your code */

}


diff --git a/1-js/04-object-basics/01-object/8-multiply-numeric/_js.view/test.js b/1-js/04-object-basics/01-object/8-multiply-numeric/_js.view/test.js
@@ -1,18 +1,18 @@
-describe("multiplyNumeric", function() {
-  it("multiplies all numeric properties by 2", function() {
    let menu = {
      width: 200,
      height: 300,
-      title: "My menu"
    };
    let result = multiplyNumeric(menu);
    assert.equal(menu.width, 400);
    assert.equal(menu.height, 600);
-    assert.equal(menu.title, "My menu");
  });

-  it("returns nothing", function() {
-    assert.isUndefined( multiplyNumeric({}) );
  });

});
diff --git a/1-js/04-object-basics/01-object/8-multiply-numeric/task.md b/1-js/04-object-basics/01-object/8-multiply-numeric/task.md
@@ -2,32 +2,32 @@ importance: 3

---

-# Multiply numeric property values by 2

-Create a function `multiplyNumeric(obj)` that multiplies all numeric property values of `obj` by `2`.

-For instance:

```js
-// before the call
let menu = {
  width: 200,
  height: 300,
-  title: "My menu"
};

multiplyNumeric(menu);

-// after the call
menu = {
  width: 400,
  height: 600,
-  title: "My menu"
};
```

-Please note that `multiplyNumeric` does not need to return anything. It should modify the object in-place.

-P.S. Use `typeof` to check for a number here.