Cool, but Useless

Transcript

1. Cool, but useless • Pál Monoczki
2. The world has changed 420K Code Line 5 Bug / 11 versions 850 $ / Code Line Started on 1969 54K Person Hour / Year 25 bn $
3. Pay your Technical Debt Technical debt are activities (like refactoring, upgrading a library, conforming to some UI or coding standard, ...) that you’ve left undone, these will hamper your progress if left undone for a longer time
6. Agile = able to move quickly and easily.
7. It turns out that style matters in programming for the same reason that it matters in writing. It makes for better reading. Douglas Crockford JavaScript: The Good
9. Noisy Code
10. public class RecentlyUsedList { private List<string> items; public RecentlyUsedList() { items = new List<string>(); } public void Add(string newItem) { if (items.Contains(newItem)) { int position = items.IndexOf(newItem); string existingItem = items[position]; items.RemoveAt(position); items.Insert(0, existingItem); } else { items.Insert(0, newItem); } } public int Count { get { int size = items.Count; return size; } } public string this[int index] { get { int position = 0; foreach (string item in items) { if (position == index) return item; ++position; } throw new
11. public class RecentlyUsedList { private List<string> items; public RecentlyUsedList() { items = new List<string>(); } public void Add(string newItem) { if (items.Contains(newItem)) { int position = items.IndexOf(newItem); string existingItem = list[position]; items.RemoveAt(position); items.Insert(0, existingItem); } else { items.Insert(0, newItem); } } public int Count { get { int size = items.Count; return size; } } public string this[int index] { get { int position = 0; foreach (string value in items) { if (position == index) return value; ++position; } throw new public class RecentlyUsedList { private List<string> items = new List<string>(); public void Add(string newItem) { items.Remove(newItem ); items.Add(newItem); } public int Count { get { return items.Count; } } public string this[int index] { get { return items[Count - index - 1]; } } }
14. Comments A delicate matter, requiring taste and judgement. I tend to err on the side of eliminating comments, for several reasons. First, if the code is clear, and uses good type names and variable names, it should explain itself. Second, comments aren't checked by the compiler, so there is no guarantee they're right, especially after the code is modified. A misleading comment can be very confusing. Third, the issue of typography: comments clutter code. Rob Pike, "Notes on Programming in C"
15. There is a famously bad comment style: i=i+1; /* Add one to i */ and there are worse ways to do it: / ********************************** Add one to i * * * * * * ********************************** / i=i+1; Don't laugh now, wait until you see it in real life. Rob Pike, "Notes on Programming in C"
16. A common fallacy is to assume authors of incomprehensible code will somehow be able to express themselves lucidly and clearly in comments.
18. Unsustainable Spacing
19. Continuing existence or cessation of existence: those are the more empow to work towa accommodat downsizings outcomes of circumstanc a greater enh the bottom l forwards to a our current d by making a opposition, t demise?
20. How many programmers lay out their code Column 80
21. How people read
22. To answer the question "What is clean design?" most succinctly: a clean design is one that supports visual thinking so people can meet their informational needs with a minimum of conscious effort.
23. public ResultType arbitraryMethodName(FirstArgumentType firs SecondArgumentType sec ThirdArgumentType thir LocalVariableType localVariable = method(firstArgument, secondArgument) if (localVariable.isSomething(thirdArgument, SOME_SHOUTY_CONSTANT)) { doSomethingWith(localVariable); } return localVariable.getSomething(); }
24. public ResultType arbitraryMethodName( FirstArgume ntType firstArgument, SecondArgumentType secondArgument, ThirdArgumentType thirdArgument) { LocalVariableType localVariable = method(firstArgument, secondArgument); if (localVariable.isSomething( thirdArgument, SOME_SHOUTY_CONSTANT)) { doSomething(localVariable); } return localVariable.getSomething(); }
25. XXXXXX XXXXXXXXXX XXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXX XXXXXXXXXXXXX XXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXX XXXXXXXXXXXXXXXXX XXXXXXXXXXXXX XXXXXXXXXXXXXXXXX XXXXXXXXXXXXX XXXXXX XXXXXXXXXXXXX XXXXXXXXXXXXXX XX XXXXXXXXXXXXX XXXXXXXXXXX XXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXX XXXXXXXXXXX XXXXXXXXXXXXX XXXXXX XXXXXXXXXXXXX XXXXXXXXXXXX
26. Lego Naming
28. Proxy Service Value create Manager Controller get Factory set Object check do enable process disable Exception add validate remove
29. public interface ConditionChecker { boolean checkCondition(); }
30. public interface Condition { boolean isTrue(); }
31. ClassNotFoundException EnumConstantNotPresentException IllegalArgumentException IllegalAccessException IndexOutOfBoundsException NegativeArraySizeException NoSuchMethodException TypeNotPresentException UnsupportedOperationException
32. ClassNotFound EnumConstantNotPresent IllegalArgument IllegalAccess IndexOutOfBounds NegativeArraySize NoSuchMethod TypeNotPresent UnsupportedOperation
33. ArithmeticException ArrayStoreException ClassCastException InstantiationException NullPointerException
34. Arithmetic ArrayStore ClassCast Instantiation NullPointer
35. IntegerDivisionByZero IllegalArrayElementType CastToNonSubclass ClassCannotBeInstantiated NullDereferenced
36. Getters and Setters
38. ^.?$|^(..+?)\1+$
39. :;while [ $? -eq 0 ];do nc -vlp 8080 -c'(r=read;e=echo;$r a b c;z=$r;while [ ${#z} -gt 2 ];do $r z;done;f=`$e $b| sed 's/[^a- z0-9_.-]//gi'`;h="HTTP/1.0";o="$h 200 OK\r\n";c="Content";if [ -z $f ];then($e $o;ls|(while $r n;do if [ -f "$n" ]; then $e "<a href=\"/$n\">`ls -gh $n`</a><br>";fi;done););elif [ -f $f ];then $e "$o$c-Type: `file -ib $f`\n$c-Length: `stat -c%s $f`";$e;cat $f;else $e -e "$h 404 Not Found\n\n404\n";fi)';done
40. https://www.amazon.com/Spikenzielabs-The-Useless-Machine-Kit/dp/ B00OCXJMS2
42. The Earth without art is just eh….