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Drag from an existing node to add a new node or link. Hit the DELETE key to remove the selected node or link.

Built with D3.js.

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Intro To LLDB and the Swift REPL

Sean Callanan

Basic debugging

• lldb commands
  • ti/ thread info
    • EXC_BAD_INSTRUCTION = CPU doesn't understand an instruction
      • typically used in assertions -> Assertion failure
  • bt / thread backtrace
• prints all frames on the stack of the current thread

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// before

func formattedAddress() -> String {
  let lines:NSMutableArray = NSMutableArray(capacity: 4)
  let zipStateCityArgs:NSMutableArray = NSMutableArray(capacity: 3)

  let zip = self.stringValueForKeyPath("address_zip")
  let city = self.stringValueForKeyPath("address_city")
  let state = self.stringValueForKeyPath("address_state")
  for arg in [zip, city, state] {

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protocol StringDecodable {
  init?(string: String)
}

extension Dictionary where Key: JSONKey, Value: AnyObject {
  /// Converts a string to an enum value
  func enumFrom<T: StringDecodable>(key: Key, _ enumType: T.Type) -> T? {
    if let s = self[key] as? String {
        return enumType.init(string: s)
    }

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import Cocoa

protocol Pet {
    var name : String { get }
    func renamed(newName: String) -> Self
}

struct Fish : Pet {
    let name : String
    func renamed(newName: String) -> Fish {

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dictionary SYSTEM "file://localhost/System/Library/DTDs/sdef.dtd">
<dictionary title="Dictionary">
    <suite name="Spotify Suite" code="spfy" description="Spotify specific classes.">
        <enumeration name="ePlS" code="ePlS">
            <enumerator name="stopped" code="kPSS">
                <cocoa integer-value="0"/>
            </enumerator>
            <enumerator name="playing" code="kPSP">
                <cocoa integer-value="1"/>

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Common Save Patterns

Standard background save

Assuming that you don't care which NSManagedObjectContext is used, and you just want to make some changes and save them in the background, use the following method. 90% of the time, this is what you'll want.

NSManagedObjectSubclass *myObject = [NSManagedObjectSubclass MR_findFirst];

[MagicalRecord saveWithBlock:^(NSManagedObjectContext *localContext) {

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import Foundation

infix operator | {}
func | (lhs: String, rhs: String) -> String {
    return NSLocalizedString(lhs, comment: rhs)
}
postfix operator | {}
postfix func | (s: String) -> String {
    return NSLocalizedString(s, comment: "")
}

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Integrating Swift With Objective-C

Introduction

• Swift is modern, type-safe, expressive, performant

• but Objective-C remains a first-class citizen

• Same design patterns, Cocoa APIs

• "We do not want you to rewrite or stop improving your existing code!"

• Should you use unowned or weak for delegates?

• To expose Objective-C to Swift, use a bridging header