# Removing repetitions from Array using the class Set

I was watching a course on Udemy and I figure out a very cool way of removing eventual repetitions of elements of an array.

It is the combination of the class **Set** with the **Spread Operator**.

## Set

Allows storage of unique values of any type.

Example of a set:
```js
const set = new Set([1, 2, 3, 3, 4, 5, 5])
console.log(set) // Set {1, 2, 3, 4, 5}
```

[Click here](https://developer.mozilla.org/pt-BR/docs/Web/JavaScript/Reference/Global_Objects/Set) to know more about the class Set.

## Spread operator

It will serve to spread the elements of the resulting Set.

Example of how the spread operator works:
```js
const a = [1, 2, 3]
const b = [4, 5, 6]

const c = [...a, ...b]
console.log(c) // [1, 2, 3, 4, 5, 6]
```

[Click here](https://developer.mozilla.org/pt-BR/docs/Web/JavaScript/Reference/Operators/Spread_operator) to learn more about the Spread operator.

## Combining both

Now, we can combine both and remove the repetitions:
```js
const initial = [1, 2, 2, 3, 4, 4, 8, 8]
const set = new Set(initial)
const final = [...set]

console.log(final) // [1, 2, 3, 4, 8]
```