Jan Stępień

Jan arbeitet als Senior Consultant bei innoQ in Deutschland. Er ist Experte für funktionale Programmiersprachen wie Clojure und Erlang. Er teilt seine Erfahrungen gerne und spricht oft auf internationalen Software-Konferenzen. Er beantwortet immer gerne eure Frage zum Thema Funktionale Programmierung und Property-Based Testing.

Vorträge

  • Mutation Testing in Continuous Delivery Pipelines

    Continuous Lifecycle 2017 16. November 2017

    Mutation testing is a method of evaluating and improving the quality of our test suites. It introduces subtle bugs to source code of our projects and checks that our tests catch those synthetic faults. High computational cost of this technique have prevented it from being widely used in our standard programming toolchain.

    Can we try to sneak it in through the backdoor of our continuous delivery pipelines? How much of it can we automate? How can our version control system help us in the process?

    Let’s try to answer those questions together.

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  • Property-based testing: You won’t look at your tests the same way ever again

    Lightweight Java User Group München August 2017 29. August 2017 Folien verfügbar

    Property-based testing changes the way you look at your test suites. Instead of specifying test cases one after another, this advanced testing technique enables you to use logic to automatically generate a stream of inputs. Despite its potential, property-based testing still remains under the radar within the Java community. Let’s try to uncover its strengths together.

    The talk will discuss how property-based testing compares to traditional testing methods and demonstrate its principles with simple examples. We will also see how it fits into a TDD workflow and a CD pipeline. In order to bust the myth of the inapplicability of property-based testing in a real-world setting we’ll bring up some use cases from industry. Finally, we’ll wander into the world of concurrency and the automation of race condition detection.

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  • Introducing structure

    Functional Programming Wroclaw #16 16. August 2017 Folien verfügbar

    Once you’ve got a couple of Clojure katas under your belt you start to wonder how to structure an entire application. Where does the logic go? Where do you respond to HTTP requests? Where to connect to the database and how to pass the connection to code which needs it? Let’s see what the best practices are and which Clojure libraries can help us.

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  • Combating spam, or how I befriended the Killer Rabbit of Caerbannog

    Munich Datageeks July 2017 27. Juli 2017 Folien verfügbar

    You might have received an unwanted email at some point. We all have. According to some studies, between 80 and 90 percent of all email is spam. Those of us with accounts at established email providers can rely on their hosts’ filters to keep their inboxes manageable. What if you’re hosting your email on your own, though? Off-the-shelf open source solutions are there when you need them, but that’s not where the fun is. Combining existing tools, building your own classifiers, and seeing them work in practice is far more exciting. Let me tell you a story, one with rabbits.

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  • Structuring Clojure Apps

    Leipzig Clojure Meetup 17. Juli 2017 Folien verfügbar

    Once you’ve got a couple of Clojure katas under your belt you start to wonder how to structure an entire application. Where does the logic go? Where do you respond to HTTP requests? Where to connect to the database and how to pass the connection to code which needs it? Let’s see what the best practices are and which Clojure libraries can help us.

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