SwiftCombination
Ruby's "combination", "permutation" in Swift.
let combos = combination([0, 1, 2], length: 2)
print(combos) // => [[0, 1], [0, 2], [1, 2]]
let rCombos = repeatedCombination([0, 1, 2], length: 2)
print(rCombos) // => [[0, 0], [0, 1], [0, 2], [1, 1], [1, 2], [2, 2]]
let a = [1, 2, 3, 4]
print(combination(a, length: 1)) // => [[1], [2], [3], [4]]
print(combination(a, length: 2)) // => [[1, 2], [1, 3], [1, 4], [2, 3], [2, 4], [3, 4]]
print(combination(a, length: 3)) // => [[1, 2, 3], [1, 2, 4], [1, 3, 4], [2, 3, 4]]
print(combination(a, length: 4)) // => [[1, 2, 3, 4]]
print(combination(a, length: 0)) // => [[]]
print(combination(a, length: 5)) // => []
// Array method
print(a.combination(3))
// => [[1, 2, 3], [1, 2, 4], [1, 3, 4], [2, 3, 4]]
// with closure
a.combination(2){ print($0) }
// =>
// [1, 2]
// [1, 3]
// [1, 4]
// [2, 3]
// [2, 4]
// [3, 4]
let chrs = ["h", "e", "l", "o", "!"]
chrs.repeatedCombination(6){ combo in
if combo.joined(separator: "") == "hello!" { print(combo) }
}
// => [h, e, l, l, o, !]
// => permutation
var chars = ["a", "c", "t"]
//chars.permutation(3){ println($0 }
// => shorthand
chars.permutation{ print($0) }
// =>
// [a, c, t]
// [a, t, c]
// [c, a, t]
// [c, t, a]
// [t, a, c]
// [t, c, a]
// repeated permutation
[0, 1].repeatedPermutation(4){ print($0) }
// =>
// [0, 0, 0, 0]
// [0, 0, 0, 1]
// [0, 0, 1, 0]
// [0, 0, 1, 1]
// [0, 1, 0, 0]
// [0, 1, 0, 1]
// [0, 1, 1, 0]
// [0, 1, 1, 1]
// [1, 0, 0, 0]
// [1, 0, 0, 1]
// [1, 0, 1, 0]
// [1, 0, 1, 1]
// [1, 1, 0, 0]
// [1, 1, 0, 1]
// [1, 1, 1, 0]
// [1, 1, 1, 1]
Installation
Swift Package Manager
Create a Package.swift file.
import PackageDescription
let package = Package(
name: "FooProject",
targets: [],
dependencies: [
.Package(url: "https://github.com/all-user/SwiftCombination.git", versions: "0.2.0"..<"0.3.0")
]
)
And, Use as follows.
import SwiftCombination