So, you can use an array for storing and retrieving data. The retrieving process by `[]` calls **indexing**.

```javascript
let arr = [1, 2, 3, 4, 5, 6];
arr[3] // it's indexing
```

But there are different methods for working with an array.

# Add element
There are different ways to add an element to an array.

### Push
The `push()` method adds a new value to the end of the array:

let arr = [1, 2, 3];

arr.push(4);
arr.push(5);
arr.push(6);

console.log(arr);

### Unshift
The `unshift()` method works like the `push()` method, but it inserts the value at the beginning of the array.

let arr = [1, 2, 3];
console.log("Array:", arr);

arr.unshift(222);  // insert element to the start

console.log("Array:", arr);

### Indexing
You can append a new value by **indexing**:

let arr = [1, 2];

arr[2] = 3;
arr[3] = 4;

console.log(arr);

You can use indexing to assign a value to a specified index, reassign a previous value, etc:

let arr = [1, 2, 3];

arr[0] = 4;
arr[15] = 243;

console.log("Array:", arr);
console.log("Length:", arr.length);

To create a new element in the array without mistakes, you need to use the `push(value)` method or `arr[arr.length] = value` expression:

let arr = [];

arr[arr.length] = "indexing";
arr.push("pushing");
arr[arr.length] = "indexing";
arr.push("pushing");

console.log(arr);

# Delete element
Sometimes you may need to delete array elements. This can be done in different ways. Now I will describe some of them.
### Pop
The `pop()` method deletes the last element in an array, and you can save it to another variable:

let arr = [11, 22, 33, 44];
console.log("Array:", arr);

let x = arr.pop();  // cut the last element in arr and save it to variable x

console.log("Popped element:", x);
console.log("Array now:", arr);

### Shift
The `shift()` method works like the `pop()` method, but cuts the **first** element from an array:


let arr = [11, 22, 33, 44, 55, 66];
console.log("Array:", arr);

let popped = arr.pop();  // cut the last element

console.log("Popped:", popped);
console.log("Array:", arr);

let shifted = arr.shift();  // cut the first element

console.log("Shifted:", shifted);
console.log("Array:", arr);

How to add an element to the end of the array?

How to remove the last element in the array?

First, let's get acquainted with JavaScript and look at its syntax. In this section, you will get a basic familiarity with the JavaScript syntax to make it easier to learn in detail later on.

Now it's time to learn about the data types that JavaScript works with. We'll start by looking at the difference between literals and variables, and then delve into the various data types.

We have become familiar with the various data types. Now, let's learn how to work with them by learning the operations we can perform with each data type.

Next, we will learn how to control the flow of execution. It's a straightforward process: we can tell the interpreter exactly what to do under certain conditions.

Next, we will explore how to shorten code using repetitive looped actions. We will examine the types of loops available in JavaScript and learn how to work with them.

Finally, to be able to write simple programs, we need to learn about functions that can make our lives much easier. We will learn how to create and use our functions.

Add element

Push

Unshift

Indexing

Delete element

Pop

Shift

Select a few correct answers