• Debug Hard: Ruby String Library Methods and Underlying C Implementations

    At this time, the Ruby String library 'reverse' method is fairly stable. However, what if the underlying C implementation had a bug? What if it produced unexpected results with certain types of inputs? e.g. strings with unicode characters. How would you catch and fix such a bug? How would you explain the unexpected results? In this talk, we'll take a close look at how Ruby's String library 'reverse' method works. In order to catch a potential underlying bug in this method, we need to understand its implementation. Where exactly is the source code? Does it have adequate unit tests? Put on your debugger hats and join me explore some powerful techniques to isolate and fix such bugs. This talk will add value to your debugging tool belt and improve your confidence in finding/fixing problems that lay underneath the current (Ruby) application programming language. Vishal Chandnani

  • The DRY Principle Is Misunderstood

    XO Group

    The Don’t Repeat Yourself Principle has swept the world, it is often the first thing new engineers are taught. It has probably affected your current code base in a big way. However, despite your code being “DRY”, your code is hard to change. The same files have to be changed over and over for seemingly unrelated reasons, and code brittleness due to tight coupling abound. You might ask yourself, “Why is this happening?” In this talk I will teach listeners that the DRY Principle is actually about eliminating duplicate representations of ideas not duplicate code. Duplicate code is often misidentified as part of this principle, and attempts to clean it up are made. The end result is lots of divergent change (one place changes for many reasons), yielding tons of pain for the development team, and eventually a clamor for a complete rewrite of the system. Steven Solomon

  • Lets Make a Ruby Microservice via AWS Lambda

    This past November AWS added a Ruby 2.5 environment for the lambda platform and is now on its 3rd version of its Ruby SDK that came out in 2011. We will be going through the steps of deploying a Ruby Microservice on AWS. The items to be covered: General microservice architecture. How to observe/monitor events that can set to trigger our Ruby function. Where do the logs go? Continuous Integration & Continuous Development Strategies for AWS Lambda. How to communicate with other services? Security groups and secure users. Testing our lambda function. Michael Garrigan

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