kconner

macOS Internals

Understand your Mac and iPhone more deeply by tracing the evolution of Mac OS X from prelease to Swift. John Siracusa delivers the details.

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lattner

Swift Concurrency Manifesto

Author: Chris Lattner

Chinese Translation by Jason Yu

Contents

• Introduction
• Overall Vision

fikeminkel

import dnssd

struct DNSTxtRecord {

  typealias DNSLookupHandler = ([String: String]?) -> Void
  
  static func lookup(_ domainName: String, completionHandler: @escaping DNSLookupHandler) {
    var mutableCompletionHandler = completionHandler // completionHandler needs to be mutable to be used as inout param
    let callback: DNSServiceQueryRecordReply = {
      (sdRef, flags, interfaceIndex, errorCode, fullname, rrtype, rrclass, rdlen, rdata, ttl, context) -> Void in