Modified "Why MacRuby Matters"

Nov 6, 2009Download as KEY, PDF0 likes492 views

This is a set of modified MacRuby presentation slides given at the Pittsburgh Ruby Brigade meeting on Nov 5, 2009. The original presentation was given by Patrick Thomson at C4[3] in September, 2009. Slides 68 and 69 were added by me for the PghRB talk. Patrick's original slides are available at http://www.slideshare.net/importantshock/why-macruby-matters

Why MacRuby Matters
Patrick Thomson

C4[3]

September 2009

“The effective exploitation of the
powers of abstraction must be
regarded as one of the most vital
activities of a computer
programmer.”

In Objective-C:
1. create a static, shared instance
2. initialize once and only once
3. add an sharedInstance accessor method

…for every singleton class.
Tedious.

units of behavior;
mix-in common functionality
across unrelated classes

With mixins:

class Example
include Singleton
# your methods here
end

C is powerful. (At the price of safety.)

We see Cʼs unsafeness throughout Objective-C.

creation, @try, and @throw are all expensive

mishmash of NSError**,
NSException, and error codes

1. code reuse
2. safety
3. syntactic abstraction

[NSArray arrayWithObjects: @"a", @"b", @"c", nil];

vs.

["a", "b", "c"]

[NSDictionary dictionaryWithObjectsAndKeys:
@"Chicago", @"location", @"C4", @"event", nil];

vs.

{"location" => "Chicago", "event" => "C4"}

[foo compare:bar] == NSComparisonResultAscending

vs.

foo < bar

I want a language that lets
Cocoa shine.

irb(main):001:0> "c4".class
=> NSMutableString
irb(main):002:0> [1, 2, 3].class
=> NSMutableArray
irb(main):003:0> {:tollfree => "bridging"}.class
=> NSMutableDictionary
irb(main):004:0> "/usr/local/bin".pathComponents
=> ["/", "usr", "local", "bin"]

Ruby objects Cocoa objects

irb(main):001:0> 3000.class
=> Fixnum
irb(main):002:0> 3000.is_a? NSNumber
=> true
irb(main):003:0> 3000.is_a? NSObject
=> true
irb(main):003:0> 3000.class.is_a? NSObject
=> true

Everything is an NSObject

Laurent Sansonetti

Vincent Isambart

Rich Kilmer

Eloy Duran

Ben Stiglitz

Matt Aimonetti

provides real solutions to
real-world problems

only one system thread can touch
the interpreter at any given time

So why should you, as Cocoa
developers, use MacRuby?

static int fib(int n)
{
if (n < 3) {
return 1;
} else {
return fib(n - 1) + fib(n - 2);
}
}

@implementation Fib

- (int)fib:(int)n
{
if (n < 3) {
return 1;
} else {
return [self fib:n - 1] + [self fib:n - 2];
}
}

@end

C Objective-C
4

3
execution time (s)

2

1

0
fib(40)

def fib(n)
if n < 3
1
else
fib(n-1) + fib(n-2)
end
end

C MacRuby Objective-C
4

3
execution time (s)

2

1

0
fib(40)

C MacRuby (compiled) Obj-C MacRuby (interpreted)
JRuby Ruby
9
execution time (seconds)

6

3

0
fib(35)

C MacRuby (compiled) Obj-C MacRuby (interpreted)

0.3
0.28
execution time (seconds)

0.24
0.2
0.2

0.15

0.1

0
fib(35)

Objective-C:

[obj setValue:val forKey:key]

Bridges:

obj.setValue_forKey(val, key)

READABILITY FAIL

[[NSImage alloc] initWithContentsOfFile:path];

becomes

image(:file => path)

[[NSGradient alloc]
initWithStartingColor: [NSColor greyColor]
endingColor: [NSColor blueColor]];

becomes

gradient(:start => color(:name => "grey"),
:end => color(:name => "blue"))

single inheritance
open classes
message-based object model
dynamically typed
garbage-collected

Objective-C is C with the Smalltalk
object model attached.

Ruby is Smalltalk with C syntax.

itʼs fully integrated with the
Cocoa toolchain

itʼs 100% compatible with every
Cocoa framework

BridgeSupport lets you call any
C-based API from MacRuby

queue = Dispatch::Queue.concurrent

queue.dispatch do
puts "Asynchronous dispatch FTW!"
end

it provides features that
Objective-C lacks

regular expressions,
tail-call optimization,
namespaces,
mixins,
operator overloading,
runtime evaluation…

What do you lose when going
from Objective-C to MacRuby?

nightly builds for 10.6 at
macruby.icoretech.org

Last summer I had an internship at Apple.
My views here, however, represent that of an open-source contributor,
and not an Apple employee. Any speculations on the future of MacRuby
are entirely mine and are in no way representative of any plans, attitudes,
or future directions that Apple may take. This presentation is neither
sponsored nor endorsed by Apple.

Apple: please donʼt sue me.

restricted mode:
no eval(), no interpreter

compliant with Appleʼs restrictions
on interpreters in iPhone apps

we need garbage collection on
the iPhone

Stay Informed
@lrz
@importantshock
@benstiglitz
@MacRuby @vincentisambart
@mattaimonetti
@alloy

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