diff --git a/1-js/05-data-types/05-array-methods/1-camelcase/_js.view/solution.js b/1-js/05-data-types/05-array-methods/1-camelcase/_js.view/solution.js
@@ -1,10 +1,10 @@
function camelize(str) {
  return str
-    .split('-') // splits 'my-long-word' into array ['my', 'long', 'word']
-    .map(
-      // capitalizes first letters of all array items except the first one
-      // converts ['my', 'long', 'word'] into ['my', 'Long', 'Word']
      (word, index) => index == 0 ? word : word[0].toUpperCase() + word.slice(1)
    )
-    .join(''); // joins ['my', 'Long', 'Word'] into 'myLongWord'
}
diff --git a/1-js/05-data-types/05-array-methods/1-camelcase/task.md b/1-js/05-data-types/05-array-methods/1-camelcase/task.md
@@ -2,18 +2,18 @@ importance: 5

---

-# Translate border-left-width to borderLeftWidth

-Write the function `camelize(str)` that changes dash-separated words like "my-short-string" into camel-cased "myShortString".

-That is: removes all dashes, each word after dash becomes uppercased.

-Examples:

```js
camelize("background-color") == 'backgroundColor';
camelize("list-style-image") == 'listStyleImage';
camelize("-webkit-transition") == 'WebkitTransition';
```

-P.S. Hint: use `split` to split the string into an array, transform it and `join` back.
diff --git a/1-js/05-data-types/05-array-methods/10-average-age/task.md b/1-js/05-data-types/05-array-methods/10-average-age/task.md
@@ -2,13 +2,13 @@ importance: 4

---

-# Get average age

-Write the function `getAverageAge(users)` that gets an array of objects with property `age` and gets the average.

-The formula for the average is `(age1 + age2 + ... + ageN) / N`.

-For instance:

```js no-beautify
let john = { name: "John", age: 25 };

diff --git a/1-js/05-data-types/05-array-methods/11-array-unique/task.md b/1-js/05-data-types/05-array-methods/11-array-unique/task.md
@@ -2,17 +2,17 @@ importance: 4

---

-# Filter unique array members

-Let `arr` be an array.

-Create a function `unique(arr)` that should return an array with unique items of `arr`.

-For instance:

```js
function unique(arr) {
-  /* your code */
}

let strings = ["Hare", "Krishna", "Hare", "Krishna",

diff --git a/1-js/05-data-types/05-array-methods/2-filter-range/solution.md b/1-js/05-data-types/05-array-methods/2-filter-range/solution.md
@@ -1,14 +1,14 @@
-```js run demo
-function filterRange(arr, a, b) {
-  // added brackets around the expression for better readability
-  return arr.filter(item => (a <= item && item <= b));
-}
-
-let arr = [5, 3, 8, 1];
-
-let filtered = filterRange(arr, 1, 4);
-
-alert( filtered ); // 3,1 (matching values)
-
-alert( arr ); // 5,3,8,1 (not modified)
-```
diff --git a/1-js/05-data-types/05-array-methods/3-filter-range-in-place/_js.view/solution.js b/1-js/05-data-types/05-array-methods/3-filter-range-in-place/_js.view/solution.js
@@ -3,8 +3,8 @@ function filterRangeInPlace(arr, a, b) {

  for (let i = 0; i < arr.length; i++) {
    let val = arr[i];
-
-    // remove if outside of the interval
    if (val < a || val > b) {
      arr.splice(i, 1);
      i--;

diff --git a/1-js/05-data-types/05-array-methods/3-filter-range-in-place/solution.md b/1-js/05-data-types/05-array-methods/3-filter-range-in-place/solution.md
@@ -1,21 +1,21 @@
-```js run demo
-function filterRangeInPlace(arr, a, b) {
-
-  for (let i = 0; i < arr.length; i++) {
-    let val = arr[i];
-
-    // remove if outside of the interval
-    if (val < a || val > b) {
-      arr.splice(i, 1);
-      i--;
-    }
-  }
-
-}
-
-let arr = [5, 3, 8, 1];
-
-filterRangeInPlace(arr, 1, 4); // removed the numbers except from 1 to 4
-
-alert( arr ); // [3, 1]
-```
diff --git a/1-js/05-data-types/05-array-methods/3-filter-range-in-place/task.md b/1-js/05-data-types/05-array-methods/3-filter-range-in-place/task.md
@@ -4,15 +4,15 @@ importance: 4

# Filter range "in place"

-Write a function `filterRangeInPlace(arr, a, b)` that gets an array `arr` and removes from it all values except those that are between `a` and `b`. The test is: `a ≤ arr[i] ≤ b`.

-The function should only modify the array. It should not return anything.

-For instance:
```js
let arr = [5, 3, 8, 1];

-filterRangeInPlace(arr, 1, 4); // removed the numbers except from 1 to 4

alert( arr ); // [3, 1]
```
diff --git a/1-js/05-data-types/05-array-methods/4-sort-back/task.md b/1-js/05-data-types/05-array-methods/4-sort-back/task.md
@@ -2,12 +2,12 @@ importance: 4

---

-# Sort in the reverse order

```js
let arr = [5, 2, 1, -10, 8];

-// ... your code to sort it in the reverse order

alert( arr ); // 8, 5, 2, 1, -10
```

diff --git a/1-js/05-data-types/05-array-methods/6-array-get-names/task.md b/1-js/05-data-types/05-array-methods/6-array-get-names/task.md
@@ -2,20 +2,20 @@ importance: 5

---

-# Map to names

-You have an array of `user` objects, each one has `user.name`. Write the code that converts it into an array of names.

-For instance:

```js no-beautify
let john = { name: "John", age: 25 };
let pete = { name: "Pete", age: 30 };
let mary = { name: "Mary", age: 28 };

-let users = [ john, pete, mary ];

-let names = /* ... your code */

alert( names ); // John, Pete, Mary
```

diff --git a/1-js/05-data-types/05-array-methods/7-map-objects/task.md b/1-js/05-data-types/05-array-methods/7-map-objects/task.md
@@ -2,13 +2,13 @@ importance: 5

---

-# Map to objects

-You have an array of `user` objects, each one has `name`, `surname` and `id`.

-Write the code to create another array from it, of objects with `id` and `fullName`, where `fullName` is generated from `name` and `surname`.

-For instance:

```js no-beautify
let john = { name: "John", surname: "Smith", id: 1 };
@@ -18,7 +18,7 @@ let mary = { name: "Mary", surname: "Key", id: 3 };
let users = [ john, pete, mary ];

*!*
-let usersMapped = /* ... your code ... */
*/!*

/*
@@ -33,4 +33,4 @@ alert( usersMapped[0].id ) // 1
alert( usersMapped[0].fullName ) // John Smith
```

-So, actually you need to map one array of objects to another. Try using `=>` here. There's a small catch.
diff --git a/1-js/05-data-types/05-array-methods/8-sort-objects/solution.md b/1-js/05-data-types/05-array-methods/8-sort-objects/solution.md
@@ -1,17 +1,17 @@
```js run no-beautify
-function sortByAge(arr) {
-  arr.sort((a, b) => a.age > b.age ? 1 : -1);
}

let john = { name: "John", age: 25 };
let pete = { name: "Pete", age: 30 };
let mary = { name: "Mary", age: 28 };

-let arr = [ pete, john, mary ];

-sortByAge(arr);

-// now sorted is: [john, mary, pete]
alert(arr[0].name); // John
alert(arr[1].name); // Mary
alert(arr[2].name); // Pete

diff --git a/1-js/05-data-types/05-array-methods/8-sort-objects/task.md b/1-js/05-data-types/05-array-methods/8-sort-objects/task.md
@@ -2,22 +2,22 @@ importance: 5

---

-# Sort users by age

-Write the function `sortByAge(users)` that gets an array of objects with the `age` property and sorts them by `age`.

-For instance:

```js no-beautify
let john = { name: "John", age: 25 };
let pete = { name: "Pete", age: 30 };
let mary = { name: "Mary", age: 28 };

-let arr = [ pete, john, mary ];

-sortByAge(arr);

-// now: [john, mary, pete]
alert(arr[0].name); // John
alert(arr[1].name); // Mary
alert(arr[2].name); // Pete