---
title: "init(_:)"
framework: swift
role: symbol
role_heading: Initializer
path: "swift/set/init(_:)-9cgks"
---

# init(_:)

Creates a new set from a finite sequence of items.

## Declaration

```swift
init<S>(_ sequence: S) where S : Sequence, Self.Element == S.Element
```

## Parameters

- `sequence`: The elements to use as members of the new set.

## Discussion

Discussion Use this initializer to create a new set from an existing sequence, like an array or a range: let validIndices = Set(0..<7).subtracting([2, 4, 5]) print(validIndices) // Prints "[6, 0, 1, 3]"

## See Also

### Creating a Set

- [init()](swift/set/init().md)
- [init(minimumCapacity:)](swift/set/init(minimumcapacity:).md)
- [init(_:)](swift/set/init(_:).md)