jballanc

class SampleController < UIViewController
  def viewDidLoad
    super

    self.view.backgroundColor = UIColor.whiteColor

    frame = UIScreen.mainScreen.applicationFrame
    origin = frame.origin
    size = frame.size
    text_view = UITextView.alloc.initWithFrame([[origin.x, origin.y],

jballanc

(defn comp-map [ma mb]
  (reduce (fn [a [k v]]
            (and a
                 (if (and (map? v) (map? (mb k)))
                   (comp-map v (mb k))
                   (= v (mb k)))))
          true
          ma))

(comp-map {:a {:b 2 :c 3}} {:a {:b 2 :c 3}})) ;=> true

jballanc

(ns space-age)

(defn on-earth [seconds]
  (/ seconds 31557600.0))

(def orbital-periods
  {:mercury 0.2408467
   :venus   0.61519726
   :mars    1.8808158
   :jupiter 11.862615

jballanc

(let [dt (elapsed-time t)
      balls (->> balls
                 (map #(move % dt))
                 (map #(keep-in-bounds dt ctx %)))]
    ;; Do stuff with balls
)

jballanc

Background

• MacRuby was going to be Ruby for OS X
• JIT Compiler or AOT Compiler
• Experimental static compilation
• The Garbage Collector - libauto

Building an App

jballanc

new-session

set -g default-command "reattach-to-user-namespace -l zsh"
set -g status-bg black
set -g status-fg green
setw -g window-status-current-bg yellow
setw -g window-status-current-fg black

set -g base-index 1
set -g renumber-windows on

jballanc

set nocompatible      " We're running Vim, not Vi!
syntax on             " Enable syntax highlighting
filetype off          " Disable filetype detection to keep Vundle happy
set shiftwidth=2      " That's a good tab width
set expandtab         " ...and we don't like tab chars
set ts=8              " The only tabs we encounter should be in C code
set softtabstop=2
set tw=132            " Wrapping to 132, vt100 default
set wrap
set grepprg=/usr/local/bin/ag " Ag is best

jballanc

require 'benchmark'

class TestBench
  VALUES = { first: "A",
             second: "B",
             third: "C",
             fourth: "D" }

  def check_with_map(val)
    VALUES.fetch(val, "not found")

jballanc

Before abuse of C:

18.902s
18.798s
18.789s
18.921s
18.992s
=======
Avg: 18.880s

jballanc

+ (NSArray *)testInvocations {
    unsigned int methodCount;
    Method *methods = class_copyMethodList(self, &methodCount);
    assert(methodCount);

    Method method;
    SEL methodName;
    NSMethodSignature *methodSig;

    NSMutableArray *invocations = [[NSMutableArray alloc] init];