Download as PDF, PPTX
![@pati_gallardo
TurtleSec
C# : An Imperative C-like language?
1. var list = new List<int>(){ 40, 5, 9, 39, 19 };
2.
3. for (int i = 0; i < list.Count; i++) {
4. Console.WriteLine(list[i]);
5. }
6.
7. foreach (var item in list) {
8. Console.WriteLine(item);
9. }
@pati_gallardo 15
No Surprises](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-15-2048.jpg)
![@pati_gallardo
TurtleSec
30
1. namespace PackageName {
2. public class ClassName {
3. // Class definition
4. }
5. }
[C++] Namespaces
Recognition
Language
C#More like C++
modules really?
Drift in Meaning](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-30-2048.jpg)
![@pati_gallardo
TurtleSec
[C & C++] C# has defines!
1. #define HERE_I_AM
2. using NUnit.Framework;
3.
4. public class Preprocessor {
5. [Test]
6. public void TestPreprocessor() {
7. #if HERE_I_AM
8. Assert.Pass();
9. #else
10. Assert.Fail();
11. #endif
12. }
13. }
@pati_gallardo 31
N really though.
No preprocessor
Drift in Meaning](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-31-2048.jpg)
![@pati_gallardo
TurtleSec
[C++] Operator Overloading Use
1. Box first = new Box(new Point(1, 1), 3, 2);
2. Box second = new Box(new Point(3, 4), 3, 3);
3. Box boundingBox = first + second;
@pati_gallardo 33
Some constructs are quite elegant
with operator overloading](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-33-2048.jpg)
![@pati_gallardo
TurtleSec
[C++] Operator Overloading Definition
1. public static Box operator +(Box left, Box right) {
2. Point top =
3. new Point(Math.Min(left.top().x, right.top().x),
4. Math.Min(left.top().y, right.top().y));
5. Point bottom =
6. new Point(Math.Max(left.bottom().x, right.bottom().x),
7. Math.Max(left.bottom().y, right.bottom().y));
8. int width = bottom.x - top.x;
9. int height = bottom.y - top.y;
10. return new Box(top, width, height);
11. }
@pati_gallardo 35](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-35-2048.jpg)
![@pati_gallardo
TurtleSec
[C++] Optional Arguments
1. public class OptionalArguments {
2. private static int increase(int x, int y = 2) {
3. return x + y;
4. }
5.
6. [Test]
7. public void TestNamedParameters() {
8. Assert.AreEqual(5, increase(3));
9. }
10. }
@pati_gallardo 36](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-36-2048.jpg)
![@pati_gallardo
TurtleSec
[Objective-C] Named Parameters
1. public class NamedParameters {
2. private static int named(int x, int y) {
3. return x + y;
4. }
5.
6. [Test]
7. public void TestNamedParameters() {
8. Assert.AreEqual(5, named(y: 3, x: 2));
9. }
10. }
@pati_gallardo 37](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-37-2048.jpg)
![@pati_gallardo
TurtleSec
[C++] Struct - value type
1. struct Point {
2. public int x;
3. public int y;
4. }
@pati_gallardo 38
Similar in meaning to C++Drift in Form
In C++ structs are classes with default
public access - in C# structs are
classes that don’t allow inheritance
In C++ all types
are value types
Cognates](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-38-2048.jpg)
![@pati_gallardo
TurtleSec
[Qt?] Properties
1. public class Properties {
2. public string ReadWriteProperty { get; set; } = "Hello";
3. public string ReadOnlyProperty { get; }
4. // Auto-implemented properties must have get accessors.
5. // public string WriteOnlyProperty { set; }
6. public string PrivateReadWriteProperty { private get; set; }
7. public string ReadPrivateWriteProperty { get; private set; }
8.
9. private string PrivateReadWriteField;
10. public string WrapField {
11. set => PrivateReadWriteField = value;
12. get => PrivateReadWriteField;
13. }
14. }
@pati_gallardo 40
Magic “value”](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-40-2048.jpg)
![@pati_gallardo
TurtleSec
[C & C++] (Inline) Out Parameters
1. private static int outParam(int x, int y, out int mod) {
2. mod = x % y;
3. return x / y;
4. }
5.
6. [Test]
7. public void TestOutParameters() {
8. int quotient = outParam(25, 5, out var remainder);
9. Assert.AreEqual(0, remainder);
10. Assert.AreEqual(5, quotient);
11. }
@pati_gallardo 41
Passing int
by ref](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-41-2048.jpg)
![@pati_gallardo
TurtleSec
[] Null-conditional operators ?. and ?[]
1. int GetCoffee(List<Shop> coffeeShops, int index) {
2. // If there are any coffeeShops and
3. // if there is a shop at that index,
4. // please get me that coffee,
5. // if not, just get me 0
6. return coffeeShops?[index]?.Coffee ?? 0;
7. }
@pati_gallardo 42](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-42-2048.jpg)
![@pati_gallardo
TurtleSec
[C++ & Java] Destructor / Finalize
1. public class DestroyMe {
2. ~DestroyMe() {
3. // Might be called by the
4. // Garbage Collector
5. }
6. }
@pati_gallardo 45
More like Java
finalize
Drift in Meaning](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-45-2048.jpg)
![@pati_gallardo
TurtleSec
[Java & C++] IDisposable
1. public class DisposeMe : IDisposable {
2. private FileStream fileStream;
3.
4. public void Dispose() {
5. fileStream?.Dispose();
6. }
7. }
@pati_gallardo 48
Similar to Javas
Closeable
Drift in Form
Same semantics
Different syntax](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-48-2048.jpg)
![@pati_gallardo
TurtleSec
[Python] yield return (Generators)
1. public IEnumerable<int> YieldReturn() {
2. yield return 3;
3. yield return 4;
4. yield return 5;
5. }
6. [Test]
7. public void TestingYieldReturn() {
8. using var it = YieldReturn().GetEnumerator();
9. it.MoveNext();
10. Assert.AreEqual(3, it.Current);
11. it.MoveNext();
12. Assert.AreEqual(4, it.Current);
13. it.MoveNext();
14. Assert.AreEqual(5, it.Current);
15. }
@pati_gallardo 49](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-49-2048.jpg)
![@pati_gallardo
TurtleSec
[Python, Java, C++] IEnumerable (Lazy Iterators)
1. // C# In Depth, Jon Skeet
2. // Lazy Evaluation
3. static IEnumerable<int> Fibonacci() {
4. int current = 0;
5. int next = 1;
6. while (true) {
7. yield return current;
8. int oldCurrent = current;
9. current = next;
10. next = next + oldCurrent;
11. }
12. }
@pati_gallardo 50](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-50-2048.jpg)
![@pati_gallardo
TurtleSec
[?] Extension Methods (Extend 3-party Classes)
1. public class Target {}
2. public static class Extension {
3. public static void PrintHello(this Target t) {
4. Console.WriteLine("Hello World");
5. }
6. }
7. public class Test {
8. [Test]
9. public void TestExtension() {
10. Target target = new Target();
11. target.PrintHello();
12. }
13. }
@pati_gallardo 51](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-51-2048.jpg)
![@pati_gallardo
TurtleSec
[C & C++] Delegates (Fancy Function Pointers)
1. public class DelegateTest {
2. public delegate void printMe();
3. [Test]
4. public void TestExtension() {
5. printMe printHello =
6. delegate {
7. Console.WriteLine("Hello World!");
8. };
9. printHello();
10. }
11. }
@pati_gallardo 54
Function Pointer
Type
Function
DefinitionUsing Function
Pointer](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-54-2048.jpg)
![@pati_gallardo
TurtleSec
[C & C++] Delegates (Fancy Function Pointers)
1. printMe first = delegate { Console.WriteLine("Hello"); };
2. printMe second = delegate { Console.WriteLine("World"); };
3.
4. var helloWorld = first + second;
5. helloWorld();
55
Composable
Function Pointers!
Operator + defined on
“function pointers”
@pati_gallardo](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-55-2048.jpg)
![@pati_gallardo
TurtleSec
[C++ Qt] Events (Event Handlers)
1. EventHandler handler =
2. delegate {
3. Console.WriteLine("Hello Event!");
4. };
5. handler?.Invoke(this, EventArgs.Empty);
@pati_gallardo 56](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-56-2048.jpg)
![@pati_gallardo
TurtleSec
Non Zero Based Array
1. Array array = Array.CreateInstance(typeof(int),
2. new[] {2},
3. new[] {42});
4. array.SetValue(5, 42);
5. array.SetValue(6, 43);
6. Assert.AreEqual(2, array.GetLength(0));
7. Assert.AreEqual(42, array.GetLowerBound(0));
8. Assert.AreEqual(43, array.GetUpperBound(0));
9. Assert.AreEqual(5, array.GetValue(42));
10. Assert.AreEqual(6, array.GetValue(43));
@pati_gallardo 58
I mean…. Wat?](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-58-2048.jpg)
![@pati_gallardo
TurtleSec
[JavaScript] Anonymous Types
1. var gilmoreGirls =
2. new[] {
3. new { Name = "Loralai", Age = "36" },
4. new { Name = "Rory", Age = "20" }
5. };
@pati_gallardo 61
If you squint it looks
a bit like JS objects](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-61-2048.jpg)
![@pati_gallardo
TurtleSec
[JavaScript] ExpandoObject
1. public delegate void printMe();
2.
3. [Test]
4. public void Test() {
5. dynamic expando = new ExpandoObject();
6. // Add a field
7. expando.GilmoreGirl = "Rory";
8. Assert.AreEqual("Rory", expando.GilmoreGirl);
9. // Add a function
10. printMe order = delegate { Console.WriteLine("Coffee!"); };
11. expando.getCoffee = order;
12. expando.getCoffee();
13. }
14.
@pati_gallardo 62
Full on JS!](https://image.slidesharecdn.com/tryingtolearnc-190621145519/75/Trying-to-learn-C-NDC-Oslo-2019-62-2048.jpg)
Uploaded byPatricia Aas
Trying to learn C# (NDC Oslo 2019)
The document discusses various programming language concepts and how they are implemented in C# compared to other languages like C++. It provides code examples of concepts like namespaces, operator overloading, optional arguments, structs, properties, and delegates in C# and compares them to their implementation in C++ or other languages. It emphasizes finding the similarities between languages but also pointing out differences or potential "false friends" where the implementation or semantics have drifted from the original.
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Similar to Trying to learn C# (NDC Oslo 2019)
Trying to learn C# (NDC Oslo 2019)
- 1.
- 2. @pati_gallardo TurtleSec 2 How do youlearn a new programming language? Submit a talk on learning it and get it accepted?
- 3. @pati_gallardo TurtleSec 3 Where to start? Writesome code Get environmentTake notes Videos / BooksFreak out Procrastinate Ask on TwitterMake flow diagram
- 4. @pati_gallardo Turtle Sec Trying to learnC# Patricia Aas NDC Oslo 2019
- 5. @pati_gallardo Turtle Sec Patricia Aas - Trainer& Consultant C++ Programmer, Application Security Currently : TurtleSec Previously : Vivaldi, Cisco Systems, Knowit, Opera Software Master in Computer Science - main language Java Pronouns: she/her
- 6.
- 7.
- 8. @pati_gallardo TurtleSec 1. #define DEBUG1 2. 3. namespace Communication { 4. class Telephone { 5. bool log = false; 6. 7. Telephone() { 8. #if DEBUG 9. log = true; 10. #endif 11. } 12. 13. ~Telephone() { 14. log = false; 15. } 16. }; 17. } @pati_gallardo 8 1. #define DEBUG 2. 3. namespace Communication { 4. class Telephone { 5. bool log = false; 6. 7. Telephone() { 8. #if DEBUG 9. log = true; 10. #endif 11. } 12. 13. ~Telephone() { 14. log = false; 15. } 16. } 17. } Which Programming Language is this? What about this?
- 9. @pati_gallardo TurtleSec 1. #define DEBUG1 2. 3. namespace Communication { 4. class Telephone { 5. bool log = false; 6. 7. Telephone() { 8. #if DEBUG 9. log = true; 10. #endif 11. } 12. 13. ~Telephone() { 14. log = false; 15. } 16. }; 17. } @pati_gallardo 9 1. #define DEBUG 2. 3. namespace Communication { 4. class Telephone { 5. bool log = false; 6. 7. Telephone() { 8. #if DEBUG 9. log = true; 10. #endif 11. } 12. 13. ~Telephone() { 14. log = false; 15. } 16. } 17. } telephone.cpp Telephone.cs C++ C#
- 10.
- 11.
- 12.
- 13. @pati_gallardo TurtleSec 13 Much Mucho? English SpanishSame Formand Meaning False Cognates Not Same Origin!
- 14. @pati_gallardo TurtleSec 14@pati_gallardo Cognates or False Cognates? Whocares? Your mental shortcuts are working!
- 15. @pati_gallardo TurtleSec C# : AnImperative C-like language? 1. var list = new List<int>(){ 40, 5, 9, 39, 19 }; 2. 3. for (int i = 0; i < list.Count; i++) { 4. Console.WriteLine(list[i]); 5. } 6. 7. foreach (var item in list) { 8. Console.WriteLine(item); 9. } @pati_gallardo 15 No Surprises
- 16. @pati_gallardo TurtleSec C# : AFunctional Lisp-like language? 1. var list = new List<int>(){ 40, 5, 9, 39, 19 }; 2. 3. list 4. .Where(s => s < 10) 5. .ToList() 6. .ForEach(s => Console.WriteLine(s)); @pati_gallardo 16 No Surprises?
- 17. @pati_gallardo TurtleSec 17 Pigg Pig? Norwegian English False Friends “Ihad bad pigs in my tires” Same Form Stud / Nail Not Same Meaning!
- 18. @pati_gallardo TurtleSec 18@pati_gallardo False Friends Bad Assumptions Yourmental shortcuts are hurting you Drift in Meaning Special case of False Friends
- 19. @pati_gallardo TurtleSec 19 Frokost Frokost? Norwegian Danish LunchDrift inMeaning Same Origin and Form Breakfast Not Same Meaning!
- 20. @pati_gallardo TurtleSec 20 List List? Java C# ArrayList/ Vector Not SameMeaning! Same Origin and Form Linked List Drift in Meaning
- 21. @pati_gallardo TurtleSec 21 FormMeaning Origin Cognates False Friends False Cognates Driftin MeaningDrift in Form
- 22. @pati_gallardo TurtleSec @pati_gallardo How you learn dependson what you know?
- 23. @pati_gallardo TurtleSec 23@pati_gallardo First language Scheme(Lisp) I know Java - university I know C++ and C I have coded in probably 10-15 other languages. Examples: Perl, Python, JavaScript Programming for almost 20 years So what do I know?
- 24.
- 25. @pati_gallardo TurtleSec 25 What to skip? Languagesinherit from each other What is normal? What is different? Danger: False Friends Danger: Unknown Unknowns
- 26. @pati_gallardo TurtleSec 26 Plan Skip over Cognates Forloop, break, continue, if, else… If it’s “normal”, skip it
- 27. @pati_gallardo TurtleSec @pati_gallardo How do youknow that you’re not missing things? Skim?
- 28. @pati_gallardo TurtleSec 28 Learn the basics Findsurprises Too much repetition Cognates
- 29.
- 30. @pati_gallardo TurtleSec 30 1. namespace PackageName{ 2. public class ClassName { 3. // Class definition 4. } 5. } [C++] Namespaces Recognition Language C#More like C++ modules really? Drift in Meaning
- 31. @pati_gallardo TurtleSec [C & C++]C# has defines! 1. #define HERE_I_AM 2. using NUnit.Framework; 3. 4. public class Preprocessor { 5. [Test] 6. public void TestPreprocessor() { 7. #if HERE_I_AM 8. Assert.Pass(); 9. #else 10. Assert.Fail(); 11. #endif 12. } 13. } @pati_gallardo 31 N really though. No preprocessor Drift in Meaning
- 32. @pati_gallardo TurtleSec 32@pati_gallardo Operator Overloading Optional Arguments NamedParameters Struct Value Type Cognates
- 33. @pati_gallardo TurtleSec [C++] Operator OverloadingUse 1. Box first = new Box(new Point(1, 1), 3, 2); 2. Box second = new Box(new Point(3, 4), 3, 3); 3. Box boundingBox = first + second; @pati_gallardo 33 Some constructs are quite elegant with operator overloading
- 34. @pati_gallardo TurtleSec 34 Bounding box x =1 y = 1 width = 5 height = 6 (1,1) (3,4) Box boundingBox = first + second; first second
- 35. @pati_gallardo TurtleSec [C++] Operator OverloadingDefinition 1. public static Box operator +(Box left, Box right) { 2. Point top = 3. new Point(Math.Min(left.top().x, right.top().x), 4. Math.Min(left.top().y, right.top().y)); 5. Point bottom = 6. new Point(Math.Max(left.bottom().x, right.bottom().x), 7. Math.Max(left.bottom().y, right.bottom().y)); 8. int width = bottom.x - top.x; 9. int height = bottom.y - top.y; 10. return new Box(top, width, height); 11. } @pati_gallardo 35
- 36. @pati_gallardo TurtleSec [C++] Optional Arguments 1.public class OptionalArguments { 2. private static int increase(int x, int y = 2) { 3. return x + y; 4. } 5. 6. [Test] 7. public void TestNamedParameters() { 8. Assert.AreEqual(5, increase(3)); 9. } 10. } @pati_gallardo 36
- 37. @pati_gallardo TurtleSec [Objective-C] Named Parameters 1.public class NamedParameters { 2. private static int named(int x, int y) { 3. return x + y; 4. } 5. 6. [Test] 7. public void TestNamedParameters() { 8. Assert.AreEqual(5, named(y: 3, x: 2)); 9. } 10. } @pati_gallardo 37
- 38. @pati_gallardo TurtleSec [C++] Struct -value type 1. struct Point { 2. public int x; 3. public int y; 4. } @pati_gallardo 38 Similar in meaning to C++Drift in Form In C++ structs are classes with default public access - in C# structs are classes that don’t allow inheritance In C++ all types are value types Cognates
- 39.
- 40. @pati_gallardo TurtleSec [Qt?] Properties 1. publicclass Properties { 2. public string ReadWriteProperty { get; set; } = "Hello"; 3. public string ReadOnlyProperty { get; } 4. // Auto-implemented properties must have get accessors. 5. // public string WriteOnlyProperty { set; } 6. public string PrivateReadWriteProperty { private get; set; } 7. public string ReadPrivateWriteProperty { get; private set; } 8. 9. private string PrivateReadWriteField; 10. public string WrapField { 11. set => PrivateReadWriteField = value; 12. get => PrivateReadWriteField; 13. } 14. } @pati_gallardo 40 Magic “value”
- 41. @pati_gallardo TurtleSec [C & C++](Inline) Out Parameters 1. private static int outParam(int x, int y, out int mod) { 2. mod = x % y; 3. return x / y; 4. } 5. 6. [Test] 7. public void TestOutParameters() { 8. int quotient = outParam(25, 5, out var remainder); 9. Assert.AreEqual(0, remainder); 10. Assert.AreEqual(5, quotient); 11. } @pati_gallardo 41 Passing int by ref
- 42. @pati_gallardo TurtleSec [] Null-conditional operators?. and ?[] 1. int GetCoffee(List<Shop> coffeeShops, int index) { 2. // If there are any coffeeShops and 3. // if there is a shop at that index, 4. // please get me that coffee, 5. // if not, just get me 0 6. return coffeeShops?[index]?.Coffee ?? 0; 7. } @pati_gallardo 42
- 43.
- 44. @pati_gallardo TurtleSec 44 Point out falsefriends C# finalizers (also called destructors!) look like C++ destructors but act like Java’s finalize()
- 45. @pati_gallardo TurtleSec [C++ & Java]Destructor / Finalize 1. public class DestroyMe { 2. ~DestroyMe() { 3. // Might be called by the 4. // Garbage Collector 5. } 6. } @pati_gallardo 45 More like Java finalize Drift in Meaning
- 46. @pati_gallardo TurtleSec @pati_gallardo What arethe semantics?
- 47. @pati_gallardo TurtleSec 47 Learn the middle What’sthe middle? Beyond basic syntax?
- 48. @pati_gallardo TurtleSec [Java & C++]IDisposable 1. public class DisposeMe : IDisposable { 2. private FileStream fileStream; 3. 4. public void Dispose() { 5. fileStream?.Dispose(); 6. } 7. } @pati_gallardo 48 Similar to Javas Closeable Drift in Form Same semantics Different syntax
- 49. @pati_gallardo TurtleSec [Python] yield return(Generators) 1. public IEnumerable<int> YieldReturn() { 2. yield return 3; 3. yield return 4; 4. yield return 5; 5. } 6. [Test] 7. public void TestingYieldReturn() { 8. using var it = YieldReturn().GetEnumerator(); 9. it.MoveNext(); 10. Assert.AreEqual(3, it.Current); 11. it.MoveNext(); 12. Assert.AreEqual(4, it.Current); 13. it.MoveNext(); 14. Assert.AreEqual(5, it.Current); 15. } @pati_gallardo 49
- 50. @pati_gallardo TurtleSec [Python, Java, C++]IEnumerable (Lazy Iterators) 1. // C# In Depth, Jon Skeet 2. // Lazy Evaluation 3. static IEnumerable<int> Fibonacci() { 4. int current = 0; 5. int next = 1; 6. while (true) { 7. yield return current; 8. int oldCurrent = current; 9. current = next; 10. next = next + oldCurrent; 11. } 12. } @pati_gallardo 50
- 51. @pati_gallardo TurtleSec [?] Extension Methods(Extend 3-party Classes) 1. public class Target {} 2. public static class Extension { 3. public static void PrintHello(this Target t) { 4. Console.WriteLine("Hello World"); 5. } 6. } 7. public class Test { 8. [Test] 9. public void TestExtension() { 10. Target target = new Target(); 11. target.PrintHello(); 12. } 13. } @pati_gallardo 51
- 52.
- 53. @pati_gallardo TurtleSec 53 Use Terms PeopleRecognize Explain how this is different But gives folks a frame of reference Delegate -> Fancy Function Pointer
- 54. @pati_gallardo TurtleSec [C & C++]Delegates (Fancy Function Pointers) 1. public class DelegateTest { 2. public delegate void printMe(); 3. [Test] 4. public void TestExtension() { 5. printMe printHello = 6. delegate { 7. Console.WriteLine("Hello World!"); 8. }; 9. printHello(); 10. } 11. } @pati_gallardo 54 Function Pointer Type Function DefinitionUsing Function Pointer
- 55. @pati_gallardo TurtleSec [C & C++]Delegates (Fancy Function Pointers) 1. printMe first = delegate { Console.WriteLine("Hello"); }; 2. printMe second = delegate { Console.WriteLine("World"); }; 3. 4. var helloWorld = first + second; 5. helloWorld(); 55 Composable Function Pointers! Operator + defined on “function pointers” @pati_gallardo
- 56. @pati_gallardo TurtleSec [C++ Qt] Events(Event Handlers) 1. EventHandler handler = 2. delegate { 3. Console.WriteLine("Hello Event!"); 4. }; 5. handler?.Invoke(this, EventArgs.Empty); @pati_gallardo 56
- 57. @pati_gallardo TurtleSec 57@pati_gallardo Decimal Non Zero BasedArray Nullable Types What about surprises? 128 bit floating point type with 28-29 significant digit precision What else have I missed?
- 58. @pati_gallardo TurtleSec Non Zero BasedArray 1. Array array = Array.CreateInstance(typeof(int), 2. new[] {2}, 3. new[] {42}); 4. array.SetValue(5, 42); 5. array.SetValue(6, 43); 6. Assert.AreEqual(2, array.GetLength(0)); 7. Assert.AreEqual(42, array.GetLowerBound(0)); 8. Assert.AreEqual(43, array.GetUpperBound(0)); 9. Assert.AreEqual(5, array.GetValue(42)); 10. Assert.AreEqual(6, array.GetValue(43)); @pati_gallardo 58 I mean…. Wat?
- 59. @pati_gallardo TurtleSec Nullable Types 1. bool?maybe = null; 2. 3. if (maybe ?? true) 4. Console.WriteLine("Print Me!"); 5. 6. maybe = false; 7. 8. if (!maybe ?? false) 9. Console.WriteLine("Print me too!"); @pati_gallardo 59 Maybe??
- 60.
- 61. @pati_gallardo TurtleSec [JavaScript] Anonymous Types 1.var gilmoreGirls = 2. new[] { 3. new { Name = "Loralai", Age = "36" }, 4. new { Name = "Rory", Age = "20" } 5. }; @pati_gallardo 61 If you squint it looks a bit like JS objects
- 62. @pati_gallardo TurtleSec [JavaScript] ExpandoObject 1. publicdelegate void printMe(); 2. 3. [Test] 4. public void Test() { 5. dynamic expando = new ExpandoObject(); 6. // Add a field 7. expando.GilmoreGirl = "Rory"; 8. Assert.AreEqual("Rory", expando.GilmoreGirl); 9. // Add a function 10. printMe order = delegate { Console.WriteLine("Coffee!"); }; 11. expando.getCoffee = order; 12. expando.getCoffee(); 13. } 14. @pati_gallardo 62 Full on JS!
- 63. @pati_gallardo TurtleSec 63 Killer features Why C#? Njust Nice To Have
- 64. @pati_gallardo TurtleSec 64 Why would Ichoose C#? Platform Integration LINQ
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- 66. @pati_gallardo TurtleSec 66 Rewrite an applicationyou have written already Focus on the language and n the application What are the Unknown Unknowns? Hard to get confident
- 67. @pati_gallardo TurtleSec 67 FormMeaning Origin Cognates False Friends False Cognates Driftin MeaningDrift in Form Unknown Unknowns! How do you find out what you don’t know?
- 68. @pati_gallardo TurtleSec 68 The best wayto learn a programming language is to make something interesting next to someone who’s knowledgeable and kind
- 69. @pati_gallardo TurtleSec 1. #define DEBUG1 2. 3. namespace Communication { 4. class Telephone { 5. bool log = false; 6. 7. Telephone() { 8. #if DEBUG 9. log = true; 10. #endif 11. } 12. 13. ~Telephone() { 14. log = false; 15. } 16. }; 17. } @pati_gallardo 69 1. #define DEBUG 2. 3. namespace Communication { 4. class Telephone { 5. bool log = false; 6. 7. Telephone() { 8. #if DEBUG 9. log = true; 10. #endif 11. } 12. 13. ~Telephone() { 14. log = false; 15. } 16. } 17. } telephone.cpp Telephone.cs C++ C# You can have an accent in code! Or “not idiomatic”
- 70. @pati_gallardo TurtleSec 70 Where to start? Procrastinate Anythingthat gets you out of this is good Maybe even submitting a talk to a conference?
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