I presented these slides as a lightning talk at the EclipseCon Europe 2013 http://www.eclipsecon.org/europe2013/lightning-talks

1. turn ideas into code faster
Moritz Eysholdt
itemis AG

2. turn ideas into code faster
!
Java
Moritz Eysholdt
itemis AG

3. !
Java

4. !
Java

5. immutability
dispatch
data_extraction
polymorphism
caching
data_transformation
!
Java
design_patterns
state
null_state
events
persistence
localization

6. immutability
for
dispatch
data_extraction
caching
if
implements
extends
polymorphism
data_transformation
!
Java
design_patterns
while
state
null_state
events
break
;
persistence
localization
return
fields
variables

7. immutability
dispatch
caching
data_transformation
if
for
implements
data_extraction
polymorphism
!
state
null_state
events
localization
persistence
design_patterns
extends
Java
while
break
variables
fields
;
return

8. !
Xtend
Java

9. functional_programming
dispatch
templates
!
Xtend
lambdas
extension_methods
active_annotations
Java

10. functional_programming
dispatch
templates
!
Xtend
lambdas
extension_methods
active_annotations
Java

11. Java
for-if-spaghetti
List<String> result = new ArrayList<String>();
for(Integer integer: integers) {
if(integer > 10) {
result.add(“Int: ” + integer);
}
}
val result = integers.filter[it > 10].map[“Int” + it]
Xtend
functional programming

12. Java
if-else-spaghetti
String result = null;
if(foo != null) {
result = foo.value;
}
String result;
if(bar != null) {
result = bar;
} else {
result = “unset”;
}
val result = foo?.value
val result = bar ?: “unset”
Xtend
null-safe operators

13. Java
call non-member methods
backwards(reading(are(you(“X”))))
“X”.you.are.reading.backwards
Xtend
extension methods

14. Java
type-def boilerplate
Map<String, Set<Integer>> ints = new HashMap<String, Set<Integer>>();
val ints = new HashMap<String, Set<Integer>>
Xtend
type inference

15. Java
if-else-instanceof-spaghetti
if(shape instanceof Rect)
return ((Rect) shape).width * ((Rect) shape).height;
else if(shape instanceof Circle)
return ((Circle) shape).radius * 2 * PI;
else
return 0;
return switch shape {
Rect: shape.width * shape.height
Circle: shape.radius * 2 * PI
default: 0
}
Xtend
smart switch expression

16. Java
if-else-instanceof-spaghetti
Xtend
public double surface(Shape shape) {
if(shape instanceof Rect)
return surface((Rect) shape);
else if(shape instanceof Circle)
return surface((Circle) shape);
return 0;
}
protected double surface(Rectangle rect) {
return rect.width * rect.height;
}
protected double surface(Circle circle) {
return circle.radius * 2 + PI;
}
dispatch methods
def dispatch surface(Rectangle rect) {
rect.width * rect.height;
}
def dispatch surface(Circle circle) {
circle.radius * 2 + PI;
}

17. Java
immutable class boilerplate
@Data class Point {
int x
int y
}
public class Point {
private final int x;
private final int y;
public
public
public
public
public
public
Foo(int x, int x) { ... }
int getX() { ... }
int getY() { ... }
int hashCode() { ... }
boolean equals(Object obj) { ... }
String toString() { ... }
}
Xtend
@Data annotation

18. Java
getter/setter boilerplate
public class Point {
private int x;
private int y;
public
public
public
public
int getX() { ...
int getY() { ...
void setX(int x)
void setY(int y)
}
}
{ ... }
{ ... }
class Point {
@Property int x
@Property int y
}
}
Xtend
@Property annotation

19. Java
boilerplate or design pattern
public class MyClass {
...
...
...
...
...
...
...
...
...
...
...
...
{
{
{
{
...
...
...
...
}
}
}
}
@MyAnnotation class MyClass {
...
}
}
Xtend
active annotation

20. EOF