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#...
  spec.add_dependency("capistrano", [">= 1.0.0"])
#...

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My contention is that Ruby developers are more likely to use Object#is_a?, Object#respond_to?, and Class#=== in their code than Java developers are to use "instanceof". Here is some anecdotal evidence supporting this contention. It's not easy to compare the two for a number of different reasons:

1. Java projects tend to have a lot more code
2. It's hard to decide which projects are comparable to others
3. It's hard to search for uses of Class#===, which is most often used in case statements.

Nonetheless, here are some numbers which probably mean nothing.

Hibernate

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#Given a function that accepts a callback...

someFunc = (callback) ->
  #do stuff
  callback(data) if callback

#when calling it...

someFunc (data) ->
  #blah

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//from https://github.com/christkv/node-mongodb-native

var p_client = new Db('integration_tests_20', new Server("127.0.0.1", 27017, {}), {'pk':CustomPKFactory});
p_client.open(function(err, p_client) {
  p_client.dropDatabase(function(err, done) {
    p_client.createCollection('test_custom_key', function(err, collection) {
      collection.insert({'a':1}, function(err, docs) {
        collection.find({'_id':new ObjectID("aaaaaaaaaaaa")}, function(err, cursor) {
          cursor.toArray(function(err, items) {
            test.assertEquals(1, items.length);

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#given this Gemfile...

source :rubygems

gem 'rake'
gem 'sinatra', "1.3.0"
gem 'haml'
gem 'sass'
gem 'coffee-script'
gem 'pg'

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mysql> desc card_commissions;

+------------+--------------+------+-----+---------+----------------+
| Field      | Type         | Null | Key | Default | Extra          |
+------------+--------------+------+-----+---------+----------------+
| id         | int(11)      | NO   | PRI | NULL    | auto_increment |
| unique_id  | varchar(255) | YES  | MUL | NULL    |                |
| year_month | int(11)      | YES  |     | NULL    |                |
| value      | decimal(8,2) | YES  |     | NULL    |                |
| created_at | datetime     | YES  |     | NULL    |                |

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import sys
import _mysql
import time
import re

def blank_logger(name):  
	db=_mysql.connect(user="user",passwd="password",db="hitstats")
	db.query(""" SELECT sum(if(filename='nginx_timeout',totalhits,0)) blanks
	FROM `hitstats`.`serverhits` """)

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+----------------------+-------+-------+---------+---------+-----+-------+
| Name                 | Lines |   LOC | Classes | Methods | M/C | LOC/M |
+----------------------+-------+-------+---------+---------+-----+-------+
| Controllers          | 14551 | 10450 |     113 |    1127 |   9 |     7 |
| Helpers              |  2832 |  2108 |       0 |     235 |   0 |     6 |
| Models               | 21418 | 16315 |     341 |    1742 |   5 |     7 |
| Libraries            |  9900 |  8807 |      41 |     311 |   7 |    26 |
| APIs                 |   144 |   107 |       7 |       2 |   0 |    51 |
| Functional tests     | 40158 | 32061 |     112 |    2808 |  25 |     9 |
| Unit tests           | 19807 | 15513 |     113 |    1879 |  16 |     6 |

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class Foo
  def some_method
    puts "In some_method"
    def some_other_method
      puts "In some other method"
      "Foo"
    end
    "Bar"
  end
end

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(*
Copyright 2011, Tom Stuart

Description: Simple pass through of left/right arrows for Showoff
Author: Tom Stuart

Mapping:
* Left/Right: Left/Right arrow keys

*)