# init(_:) Creates an array containing the elements of a sequence. ``` init(_ s: S) where Element == S.Element, S : Sequence ``` ## Parameters `s` The sequence of elements to turn into an array. ## Discussion You can use this initializer to create an array from any other type that conforms to the `Sequence` protocol. For example, you might want to create an array with the integers from 1 through 7. Use this initializer around a range instead of typing all those numbers in an array literal. ``` let numbers = Array(1...7) print(numbers) // Prints "[1, 2, 3, 4, 5, 6, 7]" ``` You can also use this initializer to convert a complex sequence or collection type back to an array. For example, the `keys` property of a dictionary isn’t an array with its own storage, it’s a collection that maps its elements from the dictionary only when they’re accessed, saving the time and space needed to allocate an array. If you need to pass those keys to a method that takes an array, however, use this initializer to convert that list from its type of `LazyMapCollection, Int>` to a simple `[String]`. ``` func cacheImages(withNames names: [String]) { // custom image loading and caching } let namedHues: [String: Int] = ["Vermillion": 18, "Magenta": 302, "Gold": 50, "Cerise": 320] let colorNames = Array(namedHues.keys) cacheImages(withNames: colorNames) print(colorNames) // Prints "["Gold", "Cerise", "Magenta", "Vermillion"]" ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)