> For the complete documentation index, see [llms.txt](https://george-jen.gitbook.io/data-science-and-apache-spark/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://george-jen.gitbook.io/data-science-and-apache-spark/set-in-scala.md).

# Set in Scala

Like set in Python, A set in Scala is an unordered collection of distinct elements.

Set in Python is mutable, Scala has immutable and mutable sets. By default, Set in Scala is equal to scala.collection.immutable.Set, which is immutable

You can create a set by using Set(), you can convert to set by toSet method

```
//Create a set if you know elements
val s0=Set(1,2,3,4)
// s0: scala.collection.mutable.Set[Int] = Set(1, 2, 3, 4)
//Create an empty set
import scala.collection.mutable.Set
val s1:scala.collection.mutable.Set[Int]=Set()
//s1: scala.collection.mutable.Set[Int] = Set()
//Add elements to a set
val s2:scala.collection.mutable.Set[Int]=s1 + 1 +2 +3 +4
//s2: scala.collection.mutable.Set[Int] = Set(1, 2, 3, 4)
```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://george-jen.gitbook.io/data-science-and-apache-spark/set-in-scala.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.