OBSOLETED BY

PONS, Protocol-Oriented Number System in Pure Swift.

• https://github.com/dankogai/swift-pons

It has all functionality of swift-prime plus BigInt support.

swift-prime

Prime number extension in Pure Swift

SYNOPSIS

import Prime                            // not needed if you are using prime.swift directly
2.isPrime                               // true
42.isPrime                              // false
0x7FFFffff.isPrime                      // true (M31)
0.nextPrime                             // 2
Int.max.prevPrime                       // 9223372036854775783 on OS X
Int.Prime.within(0..<100)               // [2, 3, 5, 7, ... 97]
Int.Prime.within(Int.max-100..<Int.max) // [9223372036854775783]
Int.max.primeFactors                    // [7, 7, 73, 127, 337, 92737, 649657]

Requirement

Swift 2.x, both Xcode 7 and Linux.

• It emits warings on Swift 2.2 but works okay.

USAGE

In your project

Just add prime.swift to it.

Workspace

Browse all the playgrounds and the project via Prime.xcworkspace.

Playground

Just open the playground file of your OS of choice and enjoy. OSX most detaild. iOS and tvOS just for testing purpurse.

REPL

just make repl.

CAVEAT: you still have to import Prime in REPL.

  1> 42.isPrime
repl.swift:1:1: error: value of type 'Int' has no member 'isPrime'
42.isPrime
^~ ~~~~~~~

  1> import Prime
  2> 42.isPrime 
$R0: Bool = false
  3>

OS X

git clone https://github.com/dankogai/swift-prime.git
cd swift-prime
make repl

Linux

git clone https://github.com/dankogai/swift-prime.git
cd swift-prime
make SWIFTPATH=${YOUR_SWIFT_PATH} repl # ${YOUR_SWIFT_PATH}=~/swift/usr/bin in my case

CAVEAT

It used to depend on 128-bit arithmetics bridged to C but it is written to be C-Free. In exchange it is a little slower.