The document discusses various programming tools and concepts. It provides lists of popular programming languages like Java and PHP, frameworks like Spring and Rails, and version control systems like Git and Mercurial. It also discusses code examples in Java, Ruby, and Python and ways to refactor code to make it more readable and maintainable.

1. Beware: Sharp Tools

2. Tools

3. Languages
Java, PHP, Ruby

4. Frameworks
Spring, Zend, Rails

5. Command Line Tools
grep, awk, sed, ls, rm, find, ...

6. Source Control
cvs, svn, perforce, git, mercurial

7. Editors/IDEs
notepad, pico, emacs, vim, eclipse

8. <bean id="application"
class="org.springframework.richclient.application.Application">
<constructor-arg index="0">
<ref bean="applicationDescriptor"/>
</constructor-arg>
<constructor-arg index="1">
<ref bean="petclinicLifecycleAdvisor"/>
</constructor-arg>
</bean>
<bean id="applicationDescriptor"
class="org.springframework.richclient.application.support.DefaultApplicationDescr
iptor">
<property name="version">
<value>1.0</value>
</property>
<property name="buildId">
<value>20041025001</value>
</property>
</bean>
<bean id="petclinicLifecycleAdvisor”
class="org.springframework.richclient.samples.petclinic.PetClinicLifecycleAdvisor
">
<property name="windowCommandBarDefinitions">
<value>org/springframework/richclient/samples/petclinic/ui/commands-
context.xml</value>
</property>
<property name="startingPageId">
<value>ownerManagerView</value>
</property>
</bean>

9. public class Person<T>
{
private Person<T> person;
...
}
...
// --- Create an Employee person ---
Person<Employee> emplPerson = new Person<Employee>();
...
// --- Create a Customer person ---
Person<Customer> custPerson = new Person<Customer>();

10. java, spring, svn, xcode, objc

11. java, spring, svn, emacs
notepad

12. ruby, git, vi

13. ruby
optimised for programmer happiness

14. import java.util.*;
public class RedBlackTree<T extends Comparable<T>> {
public static final int red = 0;
public static final int black = 1;
private int color;
private T val;
private RedBlackTree<T> left;
private RedBlackTree<T> right;
public RedBlackTree(T x) {
val = x;
left = null;
right = null;
color = red;
}
public int color() {
return color;
}
}

15. class RedBlackTree
RED = 0
BLACK = 1
attr :color
public
def initialize(val = nil)
@left = nil
@right = nil
@val = val
@color = RedBlackTree::RED
end
end

16. compile
type checking

18. rm -fr /

19. <murder`> lol i just got the rot password to the linux
machine running the network im on
<m0zzie> you mean root pass?
<murder`> yea whatever its called do u know some cool
commands like to hack ppl?
<m0zzie> try this one.. rm -rf /etc
<phoenix> rofl
<murder`> that one just paused for ages and came up with a
few forbidden msgs
http://bash.org/?34315

20. <murder`> got any better ones?
<m0zzie> hmm.. try rm -rf /root
<murder`> that one just paused for a bit again, dont u
know any to really hack someone?
<agent3> lol
<m0zzie> ugh, ok I guess you're gonna keep harrassing us
until we tell you how to hack people aren't you?
<murder`> yep
http://bash.org/?34315

21. <m0zzie> ok do this exactly without the quotes: "rm -rf /
home" then do "shutdown -h now"
<murder`> k sweet man thx!!
[n] Quit [murder`]-[Read error: Connection reset by peer]
<m0zzie> I'm a bastard.
http://bash.org/?34315

22. git update-index --remove -- $(git ls-files '*.o')

23. git update-index --remove -- $(git ls-files '*.c')

24. $ git push
To git@github.com:myrepo
! [rejected] master -> master (non-fast-forward)
(Oh come on, just do it, we’re on a deadline)
$ git push -f

25. class String
def malkify
self.gsub(/w+/g, “Malkovich”)
end
end
puts “Have you seen the film?”.malkify
=> “Malkovich Malkovich Malkovich Malkovich
Malkovich?”

26. class Fixnum
def +(other)
self * other
end
end
puts 2 + 2
=> 2

31. def add_to_cart_or_checkout(widget,
in_cart = true)
if in_cart
cart.checkout
else
cart.add(widget)
end
end

32. def add_to_cart_or_checkout(widget,
in_cart = true, discount_offer = true)
if in_cart
cart.checkout
elsif discount_offer
cart.add(widget, widget.price *
widget.discount)
end
end

33. def add_to_cart_or_checkout(widget,
in_cart = true, discount_offer = true,
discount = 0.65)
if in_cart
cart.checkout
elsif discount_offer
cart.add(widget, widget.price * (discount !=
1.0 ?
discount : widget.discount)
end
end

34. def add_to_cart_or_checkout(widget, in_cart = true,
discount_offer = true, discount = 0.65, coupon = “”)
if in_cart
cart.checkout
elsif discount_offer
cart.add(widget, widget.price * (discount != 1.0 ?
discount : widget.discount))
if coupon != “”
cart.apply_coupon(coupon, (discount != 1.0 ? discount :
widget.discount))
end
end
end

39. def add_to_cart_or_checkout(widget,
in_cart = true)
if in_cart
cart.checkout
else
cart.add(widget)
end
end

40. def add_to_cart(widget)
cart.add(widget)
end
def checkout()
cart.checkout()
end

41. # this code processes the payroll
# and sends it
process_payroll()

42. process_payroll_and_send()

43. payroll.process()
email_to_all_staff(payroll)

44. def process(q)
p = 17 # this is the price of the
# object
cart.price += p * q
end

45. def process(quantity)
p = 17 # this is the price
cart.price += p * quantity
end

46. def increment_price(quantity)
p = 17 # this is the price
cart.price += p * quantity
end

47. def increment_price(quantity)
price = 17 # this is the price
cart.price += price * quantity
end

48. PRICE_OF_AIRCRAFT_IN_MILLIONS =
17
def increment_price_in_cart(quantity)
cart.price +=
PRICE_OF_AIRCRAFT_IN_MILLIONS
* quantity
end

49. class Cart
def increase_price_of_product(product,
delta)
unless product.price > MAX_PRICE
product.price += delta
end
end
end

50. class Cart
def increase_price_of_product(product, delta)
product.increase_price(delta)
end
end
class Product
def increase_price(delta)
unless self.price > MAX_PRICE
self.price += delta
end
end

51. ...F..........
..............
..............

52. ...F..........
........F.....
..............

53. ...F..........
........F.....
..F.....F.....

54. ...F...FFFF
FFFF.FF.FF
.FFFFFF....

55. F