daehn

public extension IteratorProtocol {

    mutating public func any(_ predicate: (Element) throws -> Bool) rethrows -> Bool {
        guard let current = next() else { return false }
        return try predicate(current) || any(predicate)
    }

    mutating public func all(_ predicate: (Element) throws -> Bool) rethrows -> Bool {
        guard let current = next() else { return true }
        return try predicate(current) && all(predicate)

daehn

public struct MatrixIndex: BidirectionalIndexType {
  
  public let x, y : Int
  
  private let columns: Int
  
  public func successor() -> MatrixIndex {
    return (x + 1 == columns) ?
      MatrixIndex(x: 0, y: y + 1, columns: columns) :
      MatrixIndex(x: x + 1, y: y, columns: columns)

daehn

infix operator ?= {
    associativity right
    precedence 90
    assignment
}

func ?=<T>(inout variable: T?, expr: @autoclosure () -> T) {
    if variable == nil {
        variable = expr()
    }

daehn

#!/usr/bin/env xcrun swift

// $ chmod +x script.swift
// $ ./script.swift
// or $ ./script.swift -xcode=/Applications/Xcode-beta.app

import Foundation

@noreturn private func failWithError(message: String) {
    print("🚫 \(message)")

daehn

// Note: This must be used in an Xcode project that contains a bridging header
// that includes <asl.h>

import Foundation

/// Provides high-level methods to access the raw data in
/// an ASL message.
struct SystemLogEntry {
    /// Key-value pairs read from ASL message
    let data: [String : String]