Tree of programming languages

http://commons.wikimedia.org/wiki/File:Genealogical_tree_of_programming_languages.svg

Last line effect

We expose the “last line effect,” the phenomenon that the last line or statement in a micro-clone is much more likely to contain an error than the previous lines or statements. We do this by analyzing 208 open source projects and reporting on 202 faulty micro-clones.


x += o t h e r . x ;
y += o t h e r . y ;
z += o t h e r . y ;

http://www.st.ewi.tudelft.nl/~mbeller/publications/2015_beller_zaidman_karpov_the_last_line_effect_preprint.pdf

About Command Idempotency

Definition from Gregor (New ACID)
“In the world of distributed systems, idempotency translates to the fact that an operation can be invoked repeatedly without changing the result.”

http://www.eaipatterns.com/ramblings/68_acid.html
http://codebetter.com/gregyoung/2010/08/12/idempotency-vs-distibuted-transactions/

Idempotency Patterns
http://blog.jonathanoliver.com/idempotency-patterns/

What is the exact meaning of "Single" in Single responsibility principle

http://sklivvz.com/posts/i-dont-love-the-single-responsibility-principle
I don't love the single responsibility principle

How to deal with communication between aggregate roots?

http://danielwhittaker.me/2014/11/22/4-secrets-inter-aggregate-communication-event-sourced-system/