Algorithms.md

Algorithms

Swift Algorithms is an open-source package of sequence and collection algorithms, along with their related types.

Overview

The Algorithms package provides a variety of sequence and collection operations, letting you cycle over a collection's elements, find combinations and permutations, create a random sample, and more.

For example, the package includes a group of "chunking" methods, each of which breaks a collection into consecutive subsequences. One version tests adjacent elements to find the breaking point between chunks — you can use it to quickly separate an array into ascending runs:

let numbers = [10, 20, 30, 10, 40, 40, 10, 20]
let chunks = numbers.chunked(by: { $0 <= $1 })
// [[10, 20, 30], [10, 40, 40], [10, 20]]

Another version looks for a change in the transformation of each successive value. You can use that to separate a list of names into groups by the first character:

let names = ["Cassie", "Chloe", "Jasmine", "Jordan", "Taylor"]
let chunks = names.chunked(on: \.first)
// [["Cassie", "Chloe"], ["Jasmine", "Jordan"], ["Taylor"]]

Explore more chunking methods and the remainder of the Algorithms package, grouped in the following topics.

Topics

• doc:CombinationsPermutations
• doc:SlicingSplitting
• doc:Chunking
• doc:Joining
• doc:Extending
• doc:Trimming
• doc:Keying
• doc:Sampling
• doc:MinAndMax
• doc:Selecting
• doc:Filtering
• doc:Reductions
• doc:Partitioning
• doc:Merging