The document discusses differences and similarities between Ruby and JavaScript. It provides examples of accessing hash values, filtering arrays, and handling asynchronous requests. Ruby uses symbols for hash keys and returns values, while JavaScript uses strings and properties. Both languages support passing functions as arguments but represent them differently.

1. 2010
2010/07/16
@kei_s

2. ( )
id:kei-s, @kei_s
RubyKaigi2010

4. ( )
id:kei-s, @kei_s
RubyKaigi2010

5. I like ...
Ruby
JavaScript
( Squarepusher )
( )

6. :

7. :

8. Ruby JavaScript
Ruby
JavaScript
Ajax Ruby

9. Ruby JavaScript
Ruby JavaScript

10. 1. Ajax

11. JavaScript ( with jQuery )
var user = {name: ‘kei_s’};
user.age = 26;
$.post(‘/user’, {data: user});

12. Ruby ( with Sinatra )
post ‘/user’ do
user = params
puts user.age
‘ok’
end
#=>

13. Ruby ( with Sinatra )
post ‘/user’ do
user = params
puts user.age
‘ok’
end
#=> NoMethodError:
undefined method `age'

15. Ruby ( with Sinatra )
post ‘/user’ do
user = params
puts user.age
‘ok’
end
#=> NoMethodError:
undefined method `age'

16. Ruby ( with Sinatra )
post ‘/user’ do
user = params
# puts user.age
puts user[‘age’]
‘ok’
end
#=> 26

17. JavaScript
hash.key //=> value
hash[‘key’] //=> value
Ruby
hash.key #=> key
hash[‘key’] #=> value

18. 2.

19. Ruby
users = [
{'age'=>22},{'age'=>26},{'age'=>31}
]
users.select{|user|
user[‘age’] < 30
}.size
#=> 2

20. JavaScript
var users = [
{'age': 22},{'age': 26},{'age': 31}
];
users.filter(function(user){
user.age < 30;
}).length;
//=>

21. JavaScript
var users = [
{'age': 22},{'age': 26},{'age': 31}
];
users.filter(function(user){
user.age < 30;
}).length;
//=> 0

23. JavaScript
var users = [
{'age': 22},{'age': 26},{'age': 31}
];
users.filter(function(user){
user.age < 30;
}).length;
//=> 0

24. JavaScript
var users = [
{'age': 22},{'age': 26},{'age': 31}
];
users.filter(function(user){
//user.age < 30;
return user.age < 30;
}).length; //=> 2

25. JavaScript
function(){ v; } //=> undefined
function(){ return v; } //=> v
Ruby
def func() v; end #=> v
def func() return v; end #=> v

26. 3.

27. JavaScript ( with jQuery )
$.get(‘/user.json’,
function(response){
console.log( response );
}
);

28. Ruby ( with Typhoeus )
hydra = Typhoues::Hydra.new
request= Typhoeus::Request.new(‘/user.json’)
request.on_complete do |response|
puts response.body
end
hydra.queue request
hydra.run

29. JavaScript ( with jQuery )
$.get(‘/user.json’,
function(response){
console.log( response );
}
);

30. JavaScript ( with jQuery )
Users.prototype.store = function(response) {
this.responses.push(response);
};
var users = new Users();
$.get(‘/user1.json’,users.store);
$.get(‘/user2.json’,users.store);

31. Ruby ( with Typhoeus )
def Users.store(response)
@responses << response
end
users = Users.new
request1 = Typhoeus::Request.new(‘/user1.json’)
request2 = Typhoeus::Request.new(‘/user2.json’)
request1.on_complete(users.store)
request2.on_complete(users.store)
hydra.queue request1
hydra.queue request2
hydra.run
#=>

32. Ruby ( with Typhoeus )
def Users.store(response)
@responses << response
end
users = Users.new
request1 = Typhoeus::Request.new(‘/user1.json’)
request2 = Typhoeus::Request.new(‘/user2.json’)
request1.on_complete(users.store)
request2.on_complete(users.store)
hydra.queue request1
hydra.queue request2
hydra.run
#=> ArgumentError:
wrong number of arguments (0 for 1)

34. Ruby ( with Typhoeus )
request.on_complete(users.store)
#=> Users#store
#=> ArgumentError:
wrong number of arguments (0 for 1)

35. Ruby ( with Typhoeus )
def Users.store(response)
@responses << response
end
users = Users.new
request.on_complete do |response|
users.store(response)
end #=> OK

36. Ruby ( with Typhoeus )
def Users.store(response)
@responses << response
end
users = Users.new
request.on_complete &users.method(:store)
#=> OK
request.on_complete = users.method(:store)
#=> OK (only for Typhoeus::Request)

37. JavaScript
object.func //=> Function
Ruby
object.method(:func)
#=> Method
object.method(:func).to_proc
#=> Proc

38. Ruby JavaScript
=>

41. http://www.flickr.com/photos/magisterludi/405224443/

42. http://www.flickr.com/photos/delusionary/478351622/

43. http://www.flickr.com/photos/midgley/3687327166/

44. http://www.flickr.com/photos/hand-nor-glove/563554215/

45. A Jedi Master said ...

46. http://twitpic.com/22iyix

47. “Control, control.
You must learn control.”

50. “Control, control.
You must learn control.”

51. “Control, control.
You must learn control.”

52. http://www.flickr.com/photos/fazen/427962176/

53. http://www.flickr.com/photos/hand-nor-glove/626648592/

55. http://www.flickr.com/photos/magisterludi/405224443/

56. “Control, control.
You must learn control.”

57. “