As hackers we love to understand how stuff works and how to optimize it. A very good tool to do both is software tracing. During my talk at Tuxcon last week I showed how tracing tools work and I zoomed on one particular project called pyflame. I went over the design decisions that were made when building it. After that I showed how we can use it to trace real Python programs and generate different flame graphs.
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Very often, while working on some JavaScript app, you will try to build a class hierarchy to encapsulate code in reusable and separate components. As you know, there are no native mechanisms in nowadays JavaScript, for creating classes and supporting inheritance. Usually people use some library that allows then to do so. Even when we use a popular battle-tested framework there are things that can go wrong. In the following post I am going to show you one of them.
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