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Web Console is a debugging tool bundled with Rails. The most popular feature is a console that is shown in every development error, however, it is a general purpose debugging tool that let you execute Ruby code in any binding as it runs, through its web UI. In this talk, we'll take a look at how the web-console gem is implemented. This includes a deep dive into how exceptions in Ruby work; how to build Ruby bindings for every part of an exception backtrace, so we can execute code in them; how we interact with the DebugInspector and TracePoint C APIs to make this possible and how we supported alternative Ruby implementations like JRuby. RubyKaigi 2018 https://rubykaigi.org/2018/presentations/gsamokovarov
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