Craftsmanship: it's important!

The slides for my Detroit Craftsman Guild talk about why craftsmanship is important.

1. craftsmanship it’s important!
2. wait, who the hell are you? i’m amber conville! you can find me on the internet at these places: i develop software here, at detroit labs, which is an awesome place! twitter: @crebma
 email: crebma@gmail.com
 github: crebma
 other stuff: i’ll bet you can guess!
3. craftsmanship important? ok, back to business… why is
4. ok, what even is craftsmanship?
5. ok, what even is craftsmanship? let’s talk about history.
6. first there was agile.
7. so, agile is about teams and how teams work.
8. so, agile is about teams and how teams work. enter: software craftsmanship.
10. so what is the difference, exactly?!
11. code quality
12. code quality community involvement
13. code quality community involvement partnerships
15. ok cool, that all sounds neat. so what can i do to start learning about and practicing craftsmanship?
16. test your code
17. expect others to read your code, and preemptively make it easy to figure out whats going on.
18. expect others to read your code, and preemptively make it easy to figure out whats going on. wait, how?
19. s- single responsibility principle
20. s- single responsibility principle why does it matter?
23. o - open-closed principle
24. public class Thinger() { protected int thingerType; public int doStuff(int baseStuff) {
 if(thingerType == 4) {
 return baseStuff * 8;
 } else if (thingerType == 2) {
 return baseStuff * 12;
 } return baseStuff * 2;
 }
 } public class FourThinger extends Thinger() { public FourThinger() {
 this.thingerType = 4;
 } } public class TwoThinger extends Thinger() { public TwoThinger() {
 this.thingerType = 2;
 } }
26. public class Thinger() { public int doStuff(int baseStuff) {
 return baseStuff * 2;
 } } public class FourThinger extends Thinger() { @Override
 public int doStuff(int baseStuff) {
 return super.doStuff(baseStuff) * 4;
 } } public class TwoThinger extends Thinger() { @Override
 public int doStuff(int baseStuff) {
 return super.doStuff(baseStuff) * 6;
 } }
27. l- liskov substitution principle
28. public class Rectangle { private int width;
 private int height; public void setWidth(int width) {
 this.width = width;
 } public void setHeight(int height) {
 this.height = height;
 } public int getArea() {
 return this.width * this.height;
 } }
29. @Test
 public void rectangleWithSidesOf5And10HasAreaof100() {
 Rectangle rectangle = new Rectangle();
 rectangle.setWidth(5);
 rectangle.setHeight(10); int area = rectangle.getArea(); assertThat(area, equals(50)); //pass! yay!!
 }
31. public class Square extends Rectangle { public void setWidth(int width) {
 super.setWidth(width);
 this.height = width;
 } public void setHeight(int height) {
 super.setHeight(height)
 this.width = height;
 } }
32. @Test
 public void rectangleWithSidesOf5And10HasAreaof100() { Rectangle rectangle = new Square();
 rectangle.setWidth(5);
 rectangle.setHeight(10); int area = rectangle.getArea(); assertThat(area, equals(50)); //fail! oh nooooo, it's 100! i am so surprised right now as a consumer of this object that i have to go look at the code to see what is going on!
 }
34. i - interface segregation principle
35. d- dependency inversion principle
36. but wait, that was all about object oriented programming!
37. but wait, that was all about object oriented programming! (@nathandotz)
38. learn, grow, and contribute
39. stuff to do go to user groups, or organize them. there are tons of them in south east michigan, so look at meetup! pair with new people you don't work with all the time. go to conferences all over the place about all kinds of things, not just your favorite technology. speak at groups and conferences.
40. tl;dr be awesome as hell, and take pride in what you do.
41. thanks for listening to me ramble! @crebma