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λ ambdaj An internal DSL to manipulate collections without loops by Mario Fusco mario@exmachina.ch No more loops with
Why is lambdaj born? ,[object Object],[object Object],[object Object],[object Object],The best way to understand what lambdaj does and how it works is to start asking why we felt the need to develop it:
What is lambdaj for? ,[object Object],[object Object],[object Object],convert group aggregate sort extract index filter
How does lambdaj work? ,[object Object],[object Object],[object Object],[object Object],lambdaj is a thread safe library of static methods based on 2 main features:
That’s all you need to know to start using lambdaj It sounds easy, isn’t it? If you don’t believe  me let’s see some EXAMPLEs & DEMOs
The Demo Data Model
Print all cars’ brands ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Select all sales of a Ferrari ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Find buys of youngest person ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Find most costly sale ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Sum costs where both are males ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Find age of youngest who bought for more than 50,000 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Sort sales by cost ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Extract cars’ original cost ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Index cars by brand ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Group sales by buyers and sellers (iterative version) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Group sales by buyers and sellers   (lambdaj version) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Find most bought car (iterative version) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Find most bought car (lambdaj version) ,[object Object],[object Object],[object Object],[object Object]
How does lambdaj work? Car fastestCar = max( forEach(sales).getCar(), on(Car.class).getSpeed()); A proxy wraps the list of sales. The returned object is of class Sale but dynamically implements the Iterable interface too The getCar() invocation is propagated by the first proxy to all the sales. The cars returned by these invocations are again put in a list and another proxy, similar to the first one, is created to wrap this list, allowing to repeat this type of invocation once more (proxy concatenation). A proxy of the Car class is created in order to register the invocations on it. These invocations will be then reapplied to the cars of the former list
Performance analysis Minimum, maximum and average duration in milliseconds of 10 runs of 100,000 iterations of the former examples
Known limitations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Exception Exception
New in lambdaj 2.0 ,[object Object]
lambdaj's closure Closures (or more properly first-class functions) can be defined through the usual lambdaj DSL style Closure println =  closure (); { of (System.out).println( var (String.class));  } and then invoked  by "closing" its free variable once: println. apply ("one");   or more times: println. each ("one", "two", "three");
Closure’s features ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Closure’s features (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Switcher ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Mario Fusco [email_address] Check out lambdaj at: code.google.com/p/lambdaj Thank you

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Lambdaj (no more loops in Java) at GenevaJUG by Mario Fusco

  • 1. λ ambdaj An internal DSL to manipulate collections without loops by Mario Fusco mario@exmachina.ch No more loops with
  • 2.
  • 3.
  • 4.
  • 5. That’s all you need to know to start using lambdaj It sounds easy, isn’t it? If you don’t believe me let’s see some EXAMPLEs & DEMOs
  • 7.
  • 8.
  • 9.
  • 10.
  • 11.
  • 12.
  • 13.
  • 14.
  • 15.
  • 16.
  • 17.
  • 18.
  • 19.
  • 20. How does lambdaj work? Car fastestCar = max( forEach(sales).getCar(), on(Car.class).getSpeed()); A proxy wraps the list of sales. The returned object is of class Sale but dynamically implements the Iterable interface too The getCar() invocation is propagated by the first proxy to all the sales. The cars returned by these invocations are again put in a list and another proxy, similar to the first one, is created to wrap this list, allowing to repeat this type of invocation once more (proxy concatenation). A proxy of the Car class is created in order to register the invocations on it. These invocations will be then reapplied to the cars of the former list
  • 21. Performance analysis Minimum, maximum and average duration in milliseconds of 10 runs of 100,000 iterations of the former examples
  • 22.
  • 23.
  • 24. lambdaj's closure Closures (or more properly first-class functions) can be defined through the usual lambdaj DSL style Closure println = closure (); { of (System.out).println( var (String.class)); } and then invoked by "closing" its free variable once: println. apply ("one"); or more times: println. each ("one", "two", "three");
  • 25.
  • 26.
  • 27.
  • 28. Mario Fusco [email_address] Check out lambdaj at: code.google.com/p/lambdaj Thank you