# JavaScript Arrays 1v1

In the Seven Kingdoms of JavaScript, keeping track of your allies and enemies one by one is a recipe for defeat. To win the Iron Throne, you need a Battalion and that is exactly what an Array is.

Imagine you are a Commander in the North. If you have five soldiers but no formation, you have to call each one by their specific name to give an order.

```javascript
let soldier1 = "Jon";
let soldier2 = "Sam";
let soldier3 = "Edd";
```

  
If your army grows to 10,000, you'll run out of names before the first arrow is fired. You need them in a single, organized line.

Here comes Arrays as programming Data Structure concepts.

In the world of programming, different languages have different names for the same concept storing a collection of items. In Python, they are called **Lists**, in Java or C++, they are strictly **Arrays** and in JavaScript, we call them **Arrays**, but they behave with the flexibility of Python lists.

Regardless of the name, the logic remains the same it is an ordered collection of data stored in a single variable.

### How to Create an Array in JS

The simplest and most commonly used way is,

```javascript
const arr = [1, 2, 3, 4]
```

Why i am saying that, because after understand about array will go through varies way to create array.

### How to access value of array

Every item in an array has a specific "address" called an **Index**.

1st rule of Computers start counting from **0**.

*   The first value is at index `0`.
    
*   The second value is at index `1`.
    

```javascript
const arr = [1, 2, 3, 4]

console.log(arr[0]); // Output: 1
console.log(arr[2]); // Output: 3
```

### Updating Elements of Array

If you decide you no longer like a movie, you can swap it out. You simply target the index and assign a new value.

```javascript
arr[2] = 10; 

console.log(arr); // [1,2,10,4]
```

![](https://cdn.hashnode.com/uploads/covers/6950d1ca85602739c40abd67/ee17b468-c27c-44f2-a781-bc5018d5104b.png align="center")

That's all about array you will learn about array methods in next article.

> "In computer science, there are only two hard things: cache invalidation and naming things."
> 
> — **Phil Karlton**

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