Turning Ideas Into Code Faster

turn ideas into code faster
Moritz Eysholdt
itemis AG

turn ideas into code faster
!
Java

Moritz Eysholdt
itemis AG

immutability
dispatch
data_extraction
polymorphism

caching

data_transformation

!

Java
design_patterns
state

null_state

events
persistence

localization

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

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

functional_programming
dispatch
templates

!

Xtend
lambdas
extension_methods
active_annotations

Java

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

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

Java

call non-member methods

backwards(reading(are(you(“X”))))

“X”.you.are.reading.backwards

Xtend

extension methods

Java

type-def boilerplate

Map<String, Set<Integer>> ints = new HashMap<String, Set<Integer>>();

val ints = new HashMap<String, Set<Integer>>

Xtend

type inference

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

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;
}

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

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

Java

boilerplate or design pattern

public class MyClass {
...
...
...
...

...
...
...
...

...
...
...
...

{
{
{
{

...
...
...
...

}
}
}
}

@MyAnnotation class MyClass {
...
}

}

Xtend

active annotation

Turning Ideas Into Code Faster

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